Although all-natural, soft, and breathable, cotton undies and socks are best reserved for your time away from the gym. When you sweat, this fabric gets wet and stays wet, leading to blisters on your feet, yeast infections for your lady business, and chafing in other areas. Slip on workout clothes made of wicking material to pull moisture away from your skin to keep you dry. If natural fibers are important to you, then go with merino wool.
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