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. Available in sizes: women's: s/m (6-9. 5), l/xl (10-13. 5); men's: s/m (5-9. 5), l/xl (10-12. 5)