Carhartt 4 Pack Merino Wool Blend Crew Sock 51% Polyester, 21% Nylon, 16% Acrylic, 9% Wool, 3% Spandex Imported Pull On closure Machine Wash Carhartt classic cold weather sock delivers maximum insulation and warmth Fast dry technology in the sock yarn quickly transports sweat away from the skin so your socks stay dry and comfortable Antimicrobial technology fights the toughest odors so socks stay fresh all day along Wool and acrylic blend insulates to keep feet warm Cushioned for the ultimate comfort and protection