Carhartt Women's Ultimate Work Socks 47% Acrylic, 31% Nylon, 16% Merino Wool, 2% Lycra Spandex, 4% Other Fiber Made in US Machine Wash Merino Wool construction to keep feet cool and dry Lightweight stretch material and arch support to keep socks in place Mesh cooling channels for extra comfort Odor protection to keep socks fresh FastDry technology quickly moves sweat