Under Armour Men's Hitch Heavy II Crew Boot Socks 49% Acrylic, 23% Wool, 18% Nylon, 8% Polyester, 2% Spandex Imported Full cushion throughout provides maximum comfort and warmth Embedded arch support helps reduce foot fatigue Arm our dry material wicks moisture, accelerates evaporation Arm our Block technology helps prevent growth of odor-causing bacteria