You read that right: We are recommending that you cover yourself for the race. But more specifically, you're going to want anything but cotton. You'll get dirty and wet in this race, and cotton will only slow you down and make you less comfortable. (Trust us, you don't want to experience chaffing.) Opt for wicking T-shirts, compression shorts and spandex, as long as you don't mind them having a little bit of character at the end of the race (aka, dirty and potentially damaged).