College Edition NCAA Men's Low Cut Performance Sock 100% Other Fibers Made in US Officially licensed and made in the USA Polytek 30%,Nylon 30%,Spandex 30%, Olefin 10% - PolyTek Material helps control odor and wicks moisture from the skin 1/2 cushion low cut with arch support and mesh venting Medium Size 9-11 - fits womens shoe size 6-11 or big kids shoe size 3 1/2-7 (average age 7-12) Large Size 10-13 - fits mens shoe size 8-13