OD/Green US Army Socks (Medium 5-9) 50% Wool, 30% Cotton, 20% Nylon Men's US Army Socks Cushion Sole MIL-48K and amendments Small (Fits Shoe Size 1-5) - Medium (Fits Shoe Size 5-9) - Large (Fits Shoe Size 9-12) - XL (Fits Shoe Size 12 and up)