The Stalker Boot Sock is engineered to provide maximum warmth and comfort. Wool and high bulk acrylic fiber blend provides superior warmth and comfort moving moisture away from your feet keeping feet dry and warm. Arch support and all over cushioning provides total comfort and superior fit. Reinforced heel and toe provides added durability. Wool blend for superior moisture management Heel & toe reinforced for durability Spandex arch support and compression All over cushion for shock absorbtion & abrasion prevention Smooth flat toe seam for chafe-free comfort Sock length: 12" 60% acrylic, 20% nylon, 17% merino wool, 3% spandex Sizes: Small: Men&';s 3 - 5.5/Women&';s 4 - 6.5 Medium: Men&';s 6 - 8.5/Women&';s 7 - 9.5 Large: Men&';s 9 - 12/Women&';s 10 - 13 X-Large: Men&';s 12.5 - 15/Women&';s 13.5 - 15