Men's Thermal Socks Triple Blend Extra Warm Boot length Size 10-13 (12 Pair) 6004 70% Acylic 8% Spandex 22% Polyester Machine Wash Warm Keeps haet close to the body Extreme weather socks, thermo insulating technology Soft 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