SmartWool Toe Sock Micro Socks, Light Gray, Large 100% Wool Ultra light, non cushioned, micro height, elasticized arch brace US Unisex sizing - Small (fits women's shoe size 4-6.5) Medium (fits men's shoe size 6-8.5 or women's 7-9.5) Large (fits men's shoe size 9-11.5 or women's 10-12.5) X-Large (fits men's shoe size 12-14.5) 90% Merino Wool, 8% Nylon, 2% Elastic, washer and dryer friendly