Designed to provide protection for low intensity less strenuous activities and for consumers who prefer a product that will not change their shoe size. This NEW lightweight tennis model is designed for occasional players who prefer lightweight padding at the ball and heel and wear narrow lasted shoes. CoolMax provides superior wicking to help keep feet dry. Sock Size 10: (Men's Shoe Size: 6 - 8 / Women's Shoe Size: 7 - 9): Sock Size 11: (Men's Shoe Size: 8.5 - 10 / Women's Shoe Size 9.5 - 11.5): Sock Size 12: (Men's Shoe Size 10.5 - 11.5): Sock Size 14: (Men's Shoe Size 12 - 14).