TCK NCAA Colorado Buffs Baseline 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 CU Product Ralphie logo on the back Fiber Contents: 93% Nylon, 05% Elastic, 02% Lycra Spandex Made in the USA