TCK Krazisox Lucky Shamrock Socks Shoe Size: Small - Youth 2-6, Medium - Mens 6-9 Womens 7-10, Large - Mens 10-13 Womens 11-14 Moisture/Odor Control Antimicrobial, Blister Control Breathable Mesh, Ergonomic Cushioning Arch Compression, Heel/Toe Construction Fiber Content: 77% Polypropylene, 17% Nylon, 3% Elastic, 3% Lycra? Spandex