Vitalsox Italy Running Low Cut Light Weight Socks Size Chart: Small (Womens 5-8, Mens 4-7), Medium (Womens 8-10, Mens 7-9), Large (Womens 10-12, Mens 9-11), X-Large (Mens 11-14). Due to the stretchability of the sock, if your shoe size is between sizes, choose the smaller. Blister Protection Ankle Support Forefoot Protection Silver drySTAT technology and Compression Technology