Mato & Hash 5 Toe Active Athletic Performance Sport Toe Socks Breatheable Construction - 75% Cotton 22% Polyester 3% Spandex Designed With Performance In Mind - Bike, Walk, Run With Ease - No Bunching or Twisting 5 Toe Design Supports Natural Alignment Of Foot For Better Tactile Movement, Increased Circulation, and Increased Balance. Hygienic Alternative To Bare Feet SIZING: Small/Medium fits approximately Men's Shoe Size 4-9/Women's 5-10. Medium/Large fits approximately Men's Shoe Size 10-12 and Women's 10-11.