Carhartt Men's Force Extremes Crew Socks 39% Wool, 34% Polyester, 25% Nylon, 2% Lycra Spandex Made in the USA and Imported Pull On closure Machine Wash Force performance sock with sweat-wicking and odor-fighting technology Wool blend construction regulates temperature for optimal comfort Reinforced heel and toe for extra durability Antimicrobial technology fights the toughest odors Mesh ventilation channels cool feet for breathability