Fight the funk! The Cupron material built into these socks makes the most of copper’s natural antimicrobial properties. Cupron is EPA approved to kill 99.9% of bacteria. Made with moisture wicking TransDry cotton to keep feet cool and dry with a Cupron copper heel and toe. Both the OTC and Crew Socks feature compression zones designed for fit and all-day comfort. They’re more than socks, they’re foot armor. 82% polyester, 16% Cupron copper yarn, 2% spandex. Made in USA. California residents click here for Proposition 65 warning. (L/XL)