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Cotton may be a natural fiber, but it naturally holds moisture and takes quite a while to dry. This is an important consideration for running apparel.
For your socks, undergarments and shirts, choose a moisture-wicking, quick-drying fabric like DuPont's CoolMax. Dry garments cling – and chafe - less then wet ones. Quick-drying fabrics also help you stay cooler.
For your shorts, nylon and microfiber are good choices. They're lightweight, dry quickly, and usually don't chafe. Cotton shorts – such as old-fashioned gym shorts – hold in moisture, bunch, and chafe.