The Air-E-Ator is designed to take full advantage of the wicking capabilities of CoolMax and the abrasion resistance of nylon. The low top is perfect for running or avoiding obvious tan lines. 60% CoolMax/30% LYCRA/10% nylon. S(4-71/2), M(71/2-91/2), L(91/2-111/2), XL(111/2-14). USA (North Carolina).