Fight the funk! The Cupron material built into these socks makes the most of copper?s natural anti-microbial properties. Cupron is EPA approved to kill 99.9% of bacteria. Made with moisture-wicking polyester with a Cupron copper heel and toe, these 3-pack socks are a great value for all-day comfort. Features compression zones designed for fit and all-day comfort. They?re more than socks, they?re foot armor.