Baseline 3.0 Athletic Crew Socks (Black/Electric Green, Medium) 2% spandex Shoe Size: Small - Youth 2-6, Medium - Mens 6-9 Womens 7-10, Large - Mens 10-13 Womens 11-14 Moisture/Odor Control Antimicrobial Arch Compression and Heel/Toe Construction Blister Control, Breathable Mesh, Ergonomic Cushioning Fiber Contents: 77% Polypropylene, 17% Nylon, 03% Elastic, 03% Lycra Spandex