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The primary job of your midlayer is to provide a degree of warmth, while also being highly breathable and moving any moisture through from your technical baselayer. Fleece is the most popular type of midlayer material, although many more technical midlayers use very advanced fleece fabrics such grid backed and stretchy materials. Close fitting midlayers will perform better,during high levels of exertion, although thicker midlayers are warmer and more suitable to less strenuous activities.