Men's Thermal WOOL Blend Extra Warm Boot length Size 10-13 (6 Pair) Socks 55% Cotton 15% Wool 25% Acylic 5% Spandex Machine Wash Warm Size 10-13 6 Pack Extreme weather socks, thermo insulating technology,Wash before wearing. Soft Cotton and Wool blended with moisture wicking fibers keep feet dry and comfortable Reciprocated heel and toe for superior fit and comfort Reinforced heel and toe provides added durability,Keeps haet close to the body