PEDS Women's Coolmax White, Blue and Pink Low Cut Sock (9 Pair Pack) 30% Polyester, 28% Cotton, 23% Polyester, 16% Nylon, 3% Lycra Spandex Imported Machine Wash Coolmax fabric moisture management technology helps keep feet cool and dry Unique x configuration around the arch area hugs your feet keeps socks in place-no slipping or sliding 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