Ecosox Viscose from Bamboo Women's Quarter Sport Socks 80% Viscose from Bamboo, 10% Polyester, 5% Nylon, 3% Spandex, 2% Rubber Exclusive Ecosox construction wicks away moisture Arch support to help fight fatigue Helps control odor Helps fight and prevent foot odor Thermo-Regulating: Cool when its hot; Warm when its cold