The secret is the fusion of two technologies, graduated compression and copper-infused fibers, to help improve circulation and reduce swelling, also helping to relieve aches and pains. Miracle Copper Compression Socks are anti-microbial to naturally eliminate odors with breathable, wickable fabric to get rid of embarrassing smelly feet! Nylon/copper/spandex. Machine washable. Women's: S/M (6-9.5) Men's: S/M (5-9.5) Ships in non-retail packaging.