PEDS Little Boys' Endur Quarter Socks with Mesh Top and Arch Support Grey 38% Polyester, 33% Cotton, 25% Nylon, 4% Lycra Spandex Imported Machine Wash Coolmax xtralife fabric lasts longer and keeps feet dry, cool and comfortable Lycra fiber offers the ultimate in comfort and fit Endur technology-constructed to last up to 6X longer than our regular cotton blend socks