Foot Guard Copper Sole Socks contain Cupron yarn, which helps fight the growth of bacteria and fungi on the sock! The Natural Health Crew is also made with non-bleached, non dyed cotton to protect sensitive skin. Foot Guard is an APMA accepted product. Content: 40% Cotton, 32% Acrylic, 16% Nylon, 11% Cupron, 1% Lycra |