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.
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