TCK Kansas Jayhawks Baseline 3.0 Crew Socks Shoe Size: Small - Youth 12-5 Womens 4-7, Medium - Womens 7-10 Mens 6-9, Large - Womens 10-13 Mens 9-12, X-Large Womens 13+ Mens 12+ Official Licensed KU Product, Made in the USA Arch Compression and Heel/Toe Construction, Moisture/Odor Control Antimicrobial Blister Control, Breathable Mesh, Ergonomic Cushioning Fiber Contents: 77% Polypropylene, 17% Nylon, 3% Elastic, 3% Lycra Spandex