adidas Men's F-50 Soccer Sock 86% Nylon 11% Rayon 2% Lycra 1% Spandex Imported Worn by MLS players. Extra Small fits youth shoe sizes 9C-1Y Small fits youth shoe sizes 13C-4Y Medium fits men's shoe size 5-8.5, women's shoe size 5-9.5 & youth shoe sizes 4Y-268 Large fits men's shoe size 9-13 and women's shoe size 10-274