Base Layers: Staying Cosy with the Right Options

Baselayers are the unsung heroes of outdoor clothing systems, forming the foundation of comfort and performance in various activities and weather conditions. These garments, designed to sit directly against your skin, play a crucial role in regulating body temperature, managing moisture, and providing comfort during outdoor pursuits. Whether you're scaling a mountain, skiing down pristine slopes, or simply enjoying a brisk walk in the countryside, the right baselayer can make all the difference in your outdoor experience.

The primary purpose of a baselayer is to create a comfortable microclimate next to your skin. This is achieved through a combination of moisture management, temperature regulation, and in some cases, light insulation. By effectively managing these factors, baselayers help maintain your body's optimal temperature, allowing you to focus on your activity rather than discomfort from being too hot, cold, or damp.

Baselayers come in various weights, from lightweight options designed for high-intensity activities or warm conditions to heavyweight varieties suited for cold weather and low-intensity pursuits. The choice of weight depends on the activity, weather conditions, and personal preferences. Additionally, baselayers are available in different styles, including long-sleeve and short-sleeve tops, full-length and 3/4 length bottoms, and even one-piece suits for specific applications.

The effectiveness of a baselayer is largely determined by its fabric composition. Common materials include synthetic fibres like polyester and nylon, natural fibres such as merino wool and silk, and various blends that aim to combine the benefits of different materials. Each fabric type offers unique properties in terms of moisture-wicking, breathability, insulation, and odour resistance.

The concept of baselayers has been around for centuries, with early versions appearing in the form of simple undergarments designed to provide warmth and absorb sweat. However, the modern baselayer as we know it today began to take shape in the mid-20th century with the advent of synthetic fibres.

In the 1970s and 1980s, outdoor enthusiasts and athletes started to recognise the importance of moisture management in maintaining comfort during activities. This led to the development of specialised baselayer garments made from synthetic materials designed to wick moisture away from the skin. These early synthetic baselayers were a significant improvement over traditional cotton undergarments, which tend to retain moisture and lose insulating properties when wet.

The 1990s saw a resurgence of interest in natural fibres, particularly merino wool, as advances in processing techniques allowed for the creation of soft, non-itchy wool fabrics suitable for next-to-skin wear. This marked the beginning of a new era in baselayer technology, with merino wool offering excellent moisture management, temperature regulation, and odour resistance.

In recent years, baselayer technology has continued to evolve, with manufacturers developing increasingly sophisticated fabrics and designs. This includes the creation of hybrid materials that combine the benefits of different fibres, the incorporation of body-mapping technology to place different fabrics or knit structures in specific areas for optimal performance, and the integration of features such as antimicrobial treatments and UV protection.

Today's baselayers are highly specialised garments, engineered to meet the specific needs of different activities and conditions. From ultralight, highly breathable layers for high-intensity summer pursuits to thick, insulating options for extreme cold weather, modern baselayers offer a level of performance and versatility that early outdoor enthusiasts could only dream of.

At the heart of baselayer function is moisture management, a critical factor in maintaining comfort and performance during physical activity. When we exercise or exert ourselves, our bodies produce sweat as a natural cooling mechanism. While this process is essential for regulating body temperature, it can lead to discomfort and even dangerous situations if not properly managed.

Effective moisture management in baselayers operates on two primary principles: wicking and evaporation. Wicking refers to the process by which moisture is moved away from the skin and spread across a larger surface area of the fabric. This is typically achieved through capillary action, where the structure of the fabric fibres creates tiny channels that draw moisture away from the skin.

The effectiveness of a fabric's wicking ability depends on several factors, including the fibre type, fabric construction, and the fabric's surface area. Synthetic fibres like polyester are often praised for their excellent wicking properties, as their hydrophobic nature encourages moisture to spread quickly across the fabric surface. Natural fibres like merino wool, while not inherently as quick-wicking as synthetics, have a unique structure that allows them to absorb moisture within the fibre itself, providing a dry feel even when holding a significant amount of moisture.

Once moisture has been wicked away from the skin, the next step is evaporation. The rate of evaporation is influenced by factors such as air temperature, humidity, and air movement. Baselayers facilitate this process by spreading moisture over a large surface area, increasing the opportunity for evaporation. Some advanced baselayers incorporate different knit structures or fabric weights in various zones to optimise both wicking and evaporation based on where the body typically produces the most sweat.

Effective moisture management is crucial for several reasons. Firstly, it helps prevent the chilling effect that can occur when sweat evaporates directly from the skin. By moving moisture away from the body, baselayers help maintain a more stable microclimate next to the skin. Secondly, it reduces the risk of chafing and skin irritation that can occur when wet fabric rubs against the skin. Finally, in cold conditions, efficient moisture management is essential for preventing hypothermia, as wet skin and clothing can rapidly draw heat away from the body.

While moisture management is a crucial aspect of baselayer function, temperature regulation is equally important. Baselayers contribute to temperature regulation in several ways, working in conjunction with the body's natural thermoregulation processes.

In cold conditions, baselayers help retain body heat by trapping a thin layer of warm air next to the skin. The effectiveness of this insulation depends on the fabric type, weight, and construction. Midweight and heavyweight baselayers typically provide more insulation than lightweight options, making them suitable for colder conditions or low-intensity activities.

The insulating properties of baselayers are not just about trapping heat, but also about managing it dynamically. For example, merino wool has a unique ability to react to changes in body temperature. When you're warm and sweating, the moisture absorbed by the wool fibres triggers a heat-dissipating chemical reaction. Conversely, when you start to cool down, the fibres release this heat, helping to warm you up again.

In warmer conditions or during high-intensity activities, the focus shifts from heat retention to heat dissipation. Here, lightweight baselayers excel by facilitating rapid moisture evaporation and allowing for greater air circulation. Some advanced baselayers incorporate mesh panels or zones of thinner fabric in high-heat areas like the underarms or back to enhance ventilation.

The concept of layering plays a significant role in temperature regulation. Baselayers form the foundation of a layering system, working in conjunction with mid-layers and outer layers to provide adaptable insulation and protection. By choosing appropriate baselayer weights and combining them effectively with other layers, outdoor enthusiasts can create a versatile clothing system capable of adapting to a wide range of conditions and activity levels.

Understanding the science behind baselayer function allows users to make informed choices about which types of baselayers will best suit their needs. Whether prioritising moisture management for high-intensity activities or focusing on insulation for cold-weather pursuits, the right baselayer can significantly enhance comfort and performance in the outdoors.

When it comes to natural fibres used in baselayers, merino wool stands out as a premier choice. Derived from Merino sheep, this fibre offers an impressive array of properties that make it ideal for a wide range of conditions and activities. Merino wool fibres are extremely fine, typically measuring less than 24 microns in diameter, which contributes to their soft, non-itchy feel against the skin.

One of the most notable advantages of merino wool is its excellent moisture management capabilities. Merino fibres can absorb up to 30% of their weight in moisture without feeling wet to the touch. This absorption occurs within the fibre structure itself, allowing the surface of the fabric to remain dry and comfortable. As the moisture evaporates, it creates a cooling effect, helping to regulate body temperature in warm conditions. Conversely, in cold conditions, the presence of moisture within the fibres triggers a slight chemical reaction that generates heat, contributing to warmth.

Merino wool also boasts natural temperature-regulating properties. The crimped structure of the fibres creates tiny air pockets that trap warm air, providing insulation in cold conditions. Yet, this same structure allows for breathability, preventing overheating during high-intensity activities or in warmer weather.

Another significant advantage of merino wool is its natural odour-resistant properties. The structure of the wool fibres inhibits the growth of odour-causing bacteria, allowing merino baselayers to be worn for extended periods without developing unpleasant smells. This makes merino an excellent choice for multi-day trips or situations where washing facilities may be limited.

While merino wool offers numerous benefits, it does have some drawbacks. It tends to be more expensive than synthetic alternatives and may not be as durable as some synthetic fabrics, particularly in high-wear areas. Merino baselayers also typically take longer to dry than their synthetic counterparts, which can be a consideration in certain situations.

Silk is another natural fibre sometimes used in baselayer construction, albeit less commonly than merino wool. Silk is prized for its softness, light weight, and excellent temperature-regulating properties. It's a good insulator for its weight, making it a suitable choice for situations where minimising bulk is crucial. However, silk baselayers tend to be less durable than other options and can be quite expensive. They also don't offer the same level of odour resistance as merino wool.

Synthetic fibres, particularly polyester and nylon, are widely used in baselayer construction due to their excellent moisture-wicking properties, durability, and quick-drying nature. These materials can be engineered to provide specific performance characteristics, making them versatile choices for a range of conditions and activities.

Polyester is perhaps the most common synthetic fibre used in baselayers. It's prized for its exceptional moisture-wicking ability, drawing sweat away from the skin and spreading it across a larger surface area for rapid evaporation. Polyester is hydrophobic, meaning it doesn't absorb water, which contributes to its quick-drying nature. This makes polyester baselayers an excellent choice for high-intensity activities or situations where you need your gear to dry quickly overnight.

In addition to its moisture management properties, polyester is also quite durable and resistant to stretching and shrinking. It's relatively inexpensive to produce, which often makes polyester baselayers more affordable than natural fibre alternatives. Some advanced polyester fabrics incorporate special knit structures or treatments to enhance their performance, such as brushed interiors for added warmth or antimicrobial treatments to combat odour.

Nylon, while less common in pure form for baselayers, is often blended with other fibres to increase durability and add stretch. Nylon is known for its strength and abrasion resistance, making it a good choice for high-wear areas or for activities that put a lot of stress on clothing. Like polyester, nylon is quick-drying and has good moisture-wicking properties.

The primary drawback of synthetic baselayers is their tendency to retain odours. Unlike natural fibres like merino wool, synthetic fabrics can quickly develop unpleasant smells, especially after prolonged use or during high-intensity activities. To combat this, some manufacturers incorporate anti-microbial treatments into the fabric, but these treatments can wear off over time.

Recognising the strengths and weaknesses of different fibre types, many manufacturers have turned to blended fabrics for baselayer construction. These blends aim to combine the advantages of different materials while mitigating their drawbacks.

A common blend is merino wool with synthetic fibres. This combination seeks to marry the natural properties of wool – such as odour resistance and temperature regulation – with the durability and quick-drying nature of synthetics. The ratio of wool to synthetic can vary, with higher percentages of wool generally offering better odour resistance and temperature regulation, while higher percentages of synthetic fibres typically result in faster drying times and increased durability.

Another popular blend is polyester with elastane (also known as spandex or Lycra). The addition of elastane provides stretch and improved shape retention, enhancing the fit and comfort of the baselayer. This type of blend is particularly common in compression-style baselayers or those designed for high-mobility activities.

Some manufacturers have developed proprietary blended fabrics, combining different types of synthetic fibres or incorporating novel materials like bamboo-derived rayon. These specialised fabrics often aim to provide specific performance characteristics, such as enhanced cooling or improved durability in high-wear areas.

When choosing a baselayer fabric, consider the conditions you'll be facing, the intensity of your planned activities, and your personal preferences regarding factors like softness, durability, and odour resistance. Each type of fabric has its strengths and potential drawbacks, and the best choice will depend on your specific needs and priorities.

Lightweight baselayers are designed for high-intensity activities or warmer conditions where breathability and moisture management are the primary concerns. These thin, light fabrics excel at wicking sweat away from your skin and drying quickly, helping to keep you cool and comfortable during intense exercise or in warm weather.

Typically, lightweight baselayers are made from very fine merino wool (around 150g/m² or less) or thin synthetic fabrics. They provide minimal insulation, focusing instead on moisture management and breathability. This makes them ideal for activities like trail running, high-intensity hiking, or as a base layer for winter sports where you'll be working hard and generating a lot of heat.

One of the key advantages of lightweight baselayers is their versatility. They can be worn on their own in warm conditions or layered under other garments in cooler weather. Their thin nature also makes them easy to pack, making them a popular choice for travellers and backpackers who need to minimise bulk and weight in their gear.

In terms of specific features, lightweight baselayers often incorporate mesh panels or zones of even thinner fabric in high-sweat areas like the underarms or back. This enhances ventilation and helps to manage moisture more effectively. Some lightweight baselayers also feature UPF (Ultraviolet Protection Factor) ratings, making them suitable for use as a standalone layer in sunny conditions.

However, lightweight baselayers do have their limitations. They may not provide sufficient warmth for cold conditions or low-intensity activities. They're also typically less durable than heavier options, as the thin fabric is more prone to wear and tear. When choosing a lightweight baselayer, consider the intensity of your planned activities and the range of conditions you're likely to encounter.

Midweight baselayers strike a balance between warmth and breathability, making them the most versatile option for a wide range of conditions and activities. These baselayers provide more insulation than lightweight options while still offering good moisture-wicking capabilities.

Typically, midweight baselayers are made from merino wool in the 200-250g/m² range or equivalent thickness synthetic fabrics. They provide a moderate level of warmth, making them suitable for a wide range of temperatures and activity levels. Midweight baselayers are an excellent choice for activities like hiking, skiing, or camping in moderate conditions.

The versatility of midweight baselayers makes them a popular choice for those who want a "do-it-all" option. They can provide sufficient warmth for moderate cold when worn alone, or they can be layered with other garments for colder conditions. This adaptability is particularly useful for activities where conditions might change throughout the day, or for travellers who need a baselayer that can perform in various environments.

Midweight baselayers often incorporate features that enhance their performance across different conditions. These might include zoned construction, where different fabric weights or knit structures are used in various parts of the garment to optimise warmth and breathability. For example, a midweight baselayer might use a slightly heavier fabric in the core area for warmth, with lighter, more breathable fabric in high-sweat areas.

Another advantage of midweight baselayers is their durability. The thicker fabric typically stands up better to wear and tear compared to lightweight options, making midweight baselayers a good choice for rugged activities or extended trips.

However, midweight baselayers may be too warm for high-intensity activities or hot conditions. They also take longer to dry than lightweight options, which can be a consideration for multi-day trips where drying time is limited. When choosing a midweight baselayer, consider the range of conditions you're likely to encounter and the variety of activities you plan to undertake.

Heavyweight baselayers are designed for cold conditions and low-intensity activities, prioritising warmth over breathability. These are the thickest and warmest baselayer options, providing significant insulation to help keep you comfortable in cold environments.

Typically, heavyweight baselayers are made from thick merino wool (300g/m² or more) or bulky synthetic fabrics. They provide excellent insulation, trapping a substantial layer of warm air next to your skin. This makes them ideal for activities like ice fishing, winter camping, or any situation where you'll be stationary or moving slowly in cold conditions.

The primary advantage of heavyweight baselayers is their warmth. They can provide significant insulation even when worn alone, and when paired with appropriate mid and outer layers, can help keep you comfortable in extremely cold conditions. The thick fabric also tends to be quite durable, standing up well to abrasion and repeated washing.

Heavyweight baselayers often incorporate features designed to enhance their insulating properties. These might include a brushed or fleeced inner surface to trap more warm air, or a tighter knit structure to increase wind resistance. Some heavyweight baselayers also feature high collars or thumb holes to provide extra coverage and prevent cold spots.

However, heavyweight baselayers have some limitations. They're often too warm for high-intensity activities, potentially leading to overheating and excessive sweating. They also take longer to dry than lighter options, which can be problematic in multi-day cold weather situations. Additionally, their bulk can make them less comfortable to wear under tight-fitting outer layers and can limit your range of motion.

When choosing a heavyweight baselayer, consider the lowest temperatures you're likely to encounter and the level of activity you'll be engaging in. These baselayers are best suited for very cold conditions or situations where you'll be relatively inactive, allowing you to benefit from their superior insulating properties without risking overheating.

Baselayer tops come in a variety of styles, each designed to suit different activities, body types, and personal preferences. The style of a baselayer top can significantly impact its performance and comfort, so it's important to choose one that aligns with your intended use.

Crew neck baselayers are perhaps the most versatile and widely used style. They provide good coverage and can be worn on their own or easily layered under other garments. The classic crew neck design offers a balance of warmth and ventilation, making it suitable for a wide range of activities and conditions. This style is particularly popular for everyday wear as well as outdoor pursuits like hiking, climbing, and skiing. Crew necks work well under mid-layers and outer layers without creating bulk or uncomfortable pressure points around the neck.

V-neck baselayers offer a slightly more casual look and can provide additional ventilation compared to crew necks. The lower neckline allows for easier temperature regulation, making V-necks a good choice for activities where you might want the option to cool down quickly. This style can be particularly beneficial in warmer conditions or during high-intensity activities where extra ventilation is appreciated. However, V-necks provide less protection for the neck in cold or windy conditions, which may be a drawback in certain situations.

Turtleneck and mock neck styles feature a higher collar that provides additional warmth and protection for the neck. These styles are particularly useful in cold, windy conditions or for activities where you want to minimise exposed skin. The extra coverage can be a significant advantage when facing harsh weather, making turtlenecks and mock necks popular choices for winter sports and cold-weather expeditions. However, they may feel too warm or restrictive for some users, particularly during high-intensity activities or in milder weather.

Half-zip or quarter-zip baselayers have gained popularity due to their versatility. These styles feature a short zipper at the neck, allowing for easy temperature regulation. They combine the coverage of a higher neck with the ventilation options of a lower neckline. You can zip up for warmth or unzip for ventilation as needed, making this style particularly useful for activities where conditions can change throughout the day. Half-zip and quarter-zip baselayers are popular for skiing, hiking, and other outdoor activities where adaptability is key.

When it comes to sleeve length, baselayer tops are typically available in both long sleeve and short sleeve options. Long sleeve baselayers provide more coverage and warmth, making them ideal for cold conditions or activities where you want to protect your arms. Short sleeve baselayers are better suited to warmer conditions or high-intensity activities where maximum breathability is desired. Some brands also offer sleeveless or tank top style baselayers, which can be useful for very warm conditions or as a minimal layer under other garments.

When choosing a baselayer top style, consider the climate you'll be in, the intensity of your planned activities, and how the baselayer will fit into your overall layering system. Each style has its strengths and potential drawbacks, and the best choice will depend on your specific needs and preferences.

Baselayer bottoms, while often less varied in style than tops, still come in several different options to suit various activities and conditions. The right choice of baselayer bottom can significantly impact your comfort and performance in outdoor pursuits.

Full-length tights are the most common style for baselayer bottoms. These cover the entire leg and provide full coverage and warmth, making them ideal for cold conditions or activities where you want to protect your legs. Full-length tights can be worn under trousers or on their own (if designed for this purpose). They provide good insulation and protection for the entire leg, making them popular for winter sports, cold-weather hiking, and camping. When choosing full-length tights, consider the fit around the ankles. Some styles feature a tapered ankle to prevent bunching when worn with boots, while others may have a looser fit that can be tucked into socks.

3/4 length tights, also known as capri-length, end just below the knee. They're a good option for activities where you might be wearing tall socks or boots, as they avoid bunching at the ankle. This style can be more comfortable than full-length tights when worn with boots or tall socks, as they reduce bulk around the lower leg. 3/4 length tights are popular for activities like skiing and snowboarding, where they can be worn under ski pants without creating extra bulk in the boot area. However, they provide less coverage and warmth than full-length options, which may be a drawback in very cold conditions.

Baselayer shorts are typically form-fitting and extend to just above the knee. They're useful for warmer conditions or for wearing under looser outer shorts or trousers. Baselayer shorts provide good moisture management and can help prevent chafing during high-intensity activities. They're popular for activities like running, cycling, and high-intensity training. Some users prefer to wear baselayer shorts under full-length outer layers for added comfort and moisture management without the full coverage of long tights. However, they offer limited insulation and are not suitable for cold conditions on their own.

Some manufacturers also offer baselayer bottoms in a boxer brief style. These are essentially very short baselayer shorts, typically extending just to the upper thigh. They provide minimal coverage but can be useful for moisture management and chafe prevention in warm conditions or under other layers.

When choosing baselayer bottoms, consider the temperature range you'll be facing, the level of activity you'll be engaging in, and what outer layers you plan to wear. Full-length tights offer the most versatility for cold conditions, while shorter styles can be more comfortable in warmer weather or for high-intensity activities. Also, consider the fit of your outer layers – some people find that full-length baselayer bottoms can bunch uncomfortably under certain types of trousers or shorts.

It's worth noting that many outdoor enthusiasts choose to have multiple styles of baselayer bottoms in their gear collection. This allows for adaptation to different conditions and activities. For example, you might choose full-length tights for a cold-weather camping trip, 3/4 length tights for a day of skiing, and baselayer shorts for a summer hiking expedition.

The construction and placement of seams in a baselayer can significantly impact its comfort and performance. Modern baselayers often feature advanced seam technologies designed to enhance fit, reduce chafing, and improve overall comfort.

Flatlock seams are a common feature in high-quality baselayers. This type of seam construction reduces bulk and minimises the risk of chafing. In flatlock seams, the edges of the fabric are butted together and stitched with a flat seam, rather than overlapped. This creates a smooth, low-profile seam that's less likely to rub or irritate your skin during extended wear or high-activity situations. Flatlock seams are particularly beneficial in areas that see a lot of movement or pressure, such as under backpack straps or around the hips where a climbing harness might sit.

Some manufacturers take seam placement a step further by using body-mapping techniques. This involves strategically placing seams away from high-friction areas or pressure points. For example, a baselayer might be designed with seams that avoid the shoulder area to prevent rubbing under backpack straps. Similarly, side seams might be moved forward or backward to reduce friction in areas that see a lot of arm movement.

Seamless or minimal seam construction is another approach used in some baselayers. These garments are knitted in a tubular form, reducing or eliminating the need for side seams. This can create a more comfortable, form-fitting garment with less potential for chafing. Seamless construction is particularly popular in compression-style baselayers and those designed for high-intensity activities.

When choosing a baselayer, pay attention to the seam construction and placement, especially if you're prone to chafing or irritation. Look for flatlock seams and consider how the seam placement might interact with other gear you'll be wearing, such as backpacks or harnesses.

Thumb holes are a feature found in many long-sleeved baselayer tops. These small openings at the cuffs allow you to extend the sleeve over your hand, with your thumb protruding through the hole. This feature serves multiple purposes and can enhance the performance and comfort of your baselayer in several ways.

Firstly, thumb holes help keep the sleeves in place, preventing them from riding up during activity. This is particularly useful when layering, as it ensures your baselayer sleeves don't bunch up under other garments. The extended coverage over the back of the hand can also provide additional warmth in cold conditions, protecting an area that's often exposed to the elements.

Thumb holes can also help bridge the gap between gloves and sleeves, preventing cold spots and drafts at the wrist. This makes them particularly valuable for winter sports and cold-weather activities. Some baselayers with thumb holes are designed with extra length in the sleeves to accommodate this feature without restricting movement when the thumb holes are not in use.

However, thumb holes may not be desirable for all users or activities. Some people find them uncomfortable or restrictive, particularly if the sleeve length isn't well-suited to their arm length. It's also worth considering that the fabric around the thumb holes may wear more quickly with frequent use.

In addition to thumb holes, the design of the cuffs themselves can impact the performance of a baselayer. Some baselayers feature extended cuffs that provide extra coverage over the back of the hand, even without thumb holes. Others might have elasticated cuffs to help keep the sleeves in place and prevent drafts.

When considering a baselayer with thumb holes or specialised cuffs, think about the activities you'll be using it for and whether these features align with your needs. They can be particularly beneficial for cold-weather activities but may be unnecessary for more casual use or in warmer conditions.

Every man needs a collection of base layers to stay comfortable across winter weather scenarios.

For Casual Everyday Warmth

Patagonia Capilene Midweight Zip Neck - The zip neck provides versatile venting power, and the durable polyester layer handles moisture well and dries fast. 

Helly Hansen Lifa Merino Midweight Half Zip - This merino wool base layer is suitable for any activity performed in cold weather.  

Montane Dart XT Zip Neck - Conquer the mountains or the M&S queues in this thermal top, featuring four-way stretch and a low-profile collar.  

For Active Outdoor Pursuits 

Arc’Teryx Rho Hybrid Half Zip Top - Lightweight merino underwear offering unrestricted movement and moisture control during activities.

Icebreaker Oasis Crew - Made for hiking, climbing and skiing, this midweight merino has flatlock seams to prevent chafing when active. 

Rab Conduit Crew - Great for climbing, the Rab Conduit range is made with recycled Thermic G fleece, balancing breathability and quick wicking insulation.  

For Extreme Cold Weather 

Helly Hansen Lifa Merino Crew - Premium heavyweight merino delivering serious warmth for frigid conditions. Flatlock seams maximise comfort.  

Patagonia Capilene Thermal Midweight Zip Neck Fleece - Highly insulating polyester base layer with adjustable zippered neckline. One of the warmest layers Patagonia offers.

Icebreaker 260 Tech Long Sleeve Crew - This insulates in the harshest polar climates but remains breathable. 

Choose wool blends and polyester for casual everyday warmth around town. Rely on merino and polypro midlayers designed for outdoor recreation. Invest in ultra-warm heavyweights like heavyweight merino for expeditions in extreme cold.

Here are the top base layer recommendations to keep women cosy and warm all winter long.

For Low-Key Everyday Warmth 

Montane Primino 140 Zip Neck Top - A perfect blend of merino wool and Primaloft, this base layer also include UPF 50+ sun protection and is naturally odour resistant. 

Helly Hansen Lifa Merino Midweight Crew - Featuring the brand’s Lifa Stay Warm technology, this is a unique two-in-one base layer perfect for the outdoors.

Icebreaker 200 Oasis Long Sleeve - An odour-resistant option offering breathable fabric in a flattering silhouette.  

For Outdoor Excursions  

Patagonia Capilene Midweight Bottoms – With a smooth face for easy layering, these Patagonia leggings are ideal for outdoor activities.

Rab Conduit Pull-On Fleece - The short zip neck allows for customised venting. Its Thermic G fabrication means it excels in cold conditions.  

Ayacucho Longsleeve Baselayer - Made from responsibly sourced materials, including merino wool, this design ensures optimal freedom of movement.

Choose stylish merino and polyester layers for around-town insulation. Rely on merino midlayers designed for outdoor pursuits. Add insulating leggings or pants for ultimate warmth during frigid winter days.

For Frigid Cold

Icebreaker Merino 250 Vertex Thermal Leggings - Premium merino leggings deliver serious warmth. The merino wool retains heat and resists odour buildup. 

Helly Hansen Lifa Active Base Layer Pants - Polyester bottoms utilise Helly Hansen's Lifa fabric to provide lightweight yet insulating warmth. Quick-drying.

Rab Power Stretch Pants - Power stretch fabric allows for easy mobility while retaining warmth. Excellent as a base layer for cold weather aerobic activities. 

Choose stylish merino and polyester layers for around-town insulation. Rely on merino midlayers designed for outdoor pursuits. Add a cosy 1/2 zip or hooded layer for ultimate warmth during frigid days. 

Getting the right base layer to keep kids comfortable often comes down to looking for these key features. 

For Everyday Wear 

Patagonia Capilene Cool Lightweight Shirt - A polyester sleeveless layer great for slightly warmer fall and spring days playing outside. UPF 50+ sun protection.  

For Outdoor Activities 

Rab Merino+ 120 Short Sleeve - Short sleeve merino provides insulation for active kids while allowing freedom of movement. 

Arc'Teryx Phase AR Crew LS - This durable merino crew will keep kids warm and comfy during winter play and sports. It's reinforced in high abrasion areas for longevity.  

Patagonia Capilene Cool Daily Hoody - The hood and polyester fabric add warmth for cooler weather activities like sledding or ski lessons.

For Bitter Cold

Helly Hansen Lifa Merino 2.0 Half Zip - Specifically constructed to seal out the cold, this merino 1/2 zip is made for the youngest explorers. 

Patagonia Capilene Heavyweights Crew - Insulating polyester with elastic wrists and hem seals heat in during the coldest winter outings.

Start with versatile midweight merino or polyester for everyday schoolwear and play. Use weather-resistant merino and insulating polyester hoodies and 1/2 zips when the temperature plummets. Getting the right fit is key for keeping kids comfortable.