TCK Prosport Tube Socks. High performance athletic socks for all team sports and elite athletes. Small fits a Youth Shoe Size 2-6. Medium fits a Men's Shoe 6-9 and Women's Shoe Size 7-10. Large fits a Men's 9-12 and Women's 10-13. X-Large fits Mens 12-15 or Womens 13+. Also works great as a baseball or softball sanitary sock to go under the stirrups.