adidas Unisex Energy Running Single Otc Socks 90% Nylon/10% Spandex Imported Small fits women's shoe size 5.5-7.5 Medium fits men's Shoe size 6.5-9, Women's Shoe size 8-10.5 Large fits men's Shoe size 9.5-12, Women's Shoe size 10-12+ Matches to adidas apparel and footwear colors.