New Balance Unisex Nanotex Wicking Cotton Crew 4-Pack Sock 74% Combed Cotton, 10% Polyester, 10% 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