Men's Thermal Triple Blend Extra Warm Boot length Size 10-13 Socks 70% Cotton 25% Acylic 5% Spandex Machine Wash Warm Keeps haet close to the body 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