NIKE Performance Cushion Crew Training Socks (3 Pairs) 70% Cotton/28% Nylon/2% Spandex Imported Dri-FIT technology helps your feet stay dry and comfortable Reinforced heel and toe for enhanced durability in high-wear areas Rib cuffs for a snug, comfortable fit; arch support for a secure fit Please click on Size Chart link for men's and women's sizing