adidas Men's Copa Zone Training Crew Sock 98% Nylon,2% lycra Imported 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-246 Large fits men's shoe size 9-13 and women's shoe size 10-252