Sometimes called the insulation layer, the mid layer provides your warmth. Usually, a mid layer is either a fleece or an insulated jacket. Like a base layer, a mid layer should be breathable and able to retain heat.
Fleeces are available in different thicknesses and are quick drying and breathable, offering warmth by retaining heat and removing moisture. Down insulated jackets are packable, often with an excellent warmth to weight ratio, whereas synthetic insulated jackets are warm and waterproof.
It’s best to avoid cotton mid layers, as they will retain moisture which can lead to you getting cold. The most important consideration is to choose the right level of warmth to suit your activity and weather conditions.
In milder conditions, you may not need anything on top of your mid layer, but when the weather closes in a dedicated outer shell will be necessary.
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