Carhartt Men's Force Work Crew Socks Black: 91% Polyester, 5% Nylon, 3% Other Fibers, 1% Lycra Spandex; White: 91% Polyester, 4% Nylon, 3% Other Fibers, 2% Lycra Spandex Made in US Machine Wash Fast dry technology wicks away sweat 37.5 technology keeps feet at an ideal temperature Fights odors Mesh cooling panels for air ventilation Reinforced heel and toe