As Guy explained this winter, if you don’t wear a wicking layer next to your skin, you undo the benefit of everything that goes on top. It’d be like putting tires made of cardboard or sponge onto your top-dollar bike and wondering why it isn’t handling right.
A wicking layer sits snug against your body and lifts sweat through the fabric where it can evaporate. In winter, that means your body doesn’t waste heat trying to dry a layer that’s sitting on your skin like a wet flannel, and in summer you’re just more comfortable. Winter base layers tend also to have a little volume in the fabric, which helps to trap a welcome layer of warm air.
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