New Balance Unisex Nanotex Wicking Cotton No Show 4-Pack Sock 82% Cotton 68% Combed cotton, 13% Polyester, 13% Acrylic, 5% Nylon, 1% Lycra spandex Welt top helps sock stay up Lycra top of toe for better fit Machine wash warm with like colors non-chlorine bleach when needed tumble dry low do not iron do not dry clean Imported