Key Concept: Moisture-wicking means pulling sweat away from the skin to the fabric surface for fast evaporation, not absorbing it.
Why it's correct: Polyester doesn't absorb moisture the way natural fibers do — it moves it to the surface to evaporate quickly, keeping the wearer dry, which is why it's standard in activewear.
Why others fail: Cotton and wool both ABSORB and retain moisture (staying damp or heavy), and nylon, while strong and elastic, wicks less effectively than polyester.