In addition to the other answers, moisture wicking fabric helps spread the sweat out over a larger area instead. More area means faster evaporation. Think of when you’ve worn heavy cotton shirts and gotten sweat patches on your back, and how that doesn’t happen nearly as much with moisture wicking fabrics.
Moisture evaporating from your clothes still cools you (it cools the fabric, which in turn cools your body). It doesn’t have to evaporate directly from your skin. Without the moisture-wicking action, more sweat would just accumulate on your skin beneath the fabric, and not evaporate at all. So transporting sweat away from this “moisture-trap” and towards place where it *can* evaporate will cool you down faster.
Because cooling via sweating only works when your skin and the sweat has direct contact with the atmosphere. The point of sweat wicking fabric is that it transports the sweat to an upper layer which will then be exposed to the atmosphere where it will evaporate. This will then cool the fabric and the skin below it.
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