PEDS Women's Coolmax Anklet Sock with Comfort Top and Arch Support (6 Pair Pack) 37% Polyester, 29% Polyester, 28% Cotton, 3% Nylon, 3% Lycra Spandex Imported Machine Wash Coolmax fabric moisture management technology helps keep feet cool and dry Panels of soft elastic fibers in the arch of the foot offers support and keeps these socks in place-no slipping or sliding in your shoes Lycra fiber offers the ultimate in comfort and fit Satisfaction guarantee-if you are not completely satisfied with your PEDS product, simply return them to us for replacement