PEDS Boys Endur Low Cut Flat Knit Socks Medium 4 Pairs White With Grey Pad: 39% Polyester, 33% Cotton, 25% Nylon, 3% Lycra Spandex; White With Grey Heel And Toe: 38% Cotton, 37% Polyester, 22% Nylon, 3% 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