MongolWear Women's Mongolian Wool Socks, 2 Pair 70% Organic Mongolian Wool, 29% Nylon, 1% Spandex 2 pair, Made in Mongolia Medium size fits size US women 6-10; US men 5-9 Large size fits size US women 10.5-13; US men 9.5-12 High ankle great for hiking & incredibly warm