PEDS Big Boys' Endur Quarter Socks with Mesh Top and Arch Support Black 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 The perfect hole proof sock Endur technology-constructed to last up to 6X longer than our regular cotton blend socks