Krazisox Rainbow Stripes Over the Calf Socks Product Features Shoe Size: Small - Youth 12-4 Womens 4-6, Medium - Womens 6-9 Mens 5-8, Large - Womens 9-12 Mens 8-11, X-Large Womens 12+ Mens 11+ Item runs small, size up if in between sizes Breathable Mesh, Ergonomic Cushioning, Moisture/Odor Control Antimicrobial Arch Compression, Heel/Toe Construction, Blister Control Fiber Content: 77% Polypropylene, 17% Nylon, 3% Elastic, 3% Lycra? Spandex Product Description Rainbow Over the Calf Socks. High performance athletic socks. Shoe Size: Small - Youth 12-4 Womens 4-6, Medium - Womens 6-9 Mens 5-8, Large - Womens 9-12 Mens 8-11, X-Large Womens 12+ Mens 11+.