Carhartt Women's Traditional Ultimate Merino Wool Work Socks 46% Acrylic, 19% Polyester, 15% Nylon, 15% Wool, 3% Other Fibers, 2% Spandex Made in US Machine Wash Merino Wool Construction Arch support Mesh Cooling Channels 1 pair per package Materials: KHK: 48% Acrylic, 30% Nylon, 16% Merino Wool, 2% Spandex, 4% Other Fiber CHH: 46% Acrylic, 19% Polyester, 15% Nylon, 15% Merino Wool, 2% Spandex, 3% Other Fibers NVY: 47% Acrylic, 17% Nylon, 16% Merino Wool, 16% Polyester, 2% Spandex, 2% Other Fibers