Wigwam Cool Lite Hiker Pro Crew Socks 47% TENCEL/28% Acrylic/24% Nylon/1% Spandex Made in US Machine Wash 50% Coolmax Polyester, 22% Stretch Nylon, 21% X2O Acrylic, 7% Cotton Great year round sock for the traveler. Mesh Instep, welt top and "Y" heel pocket Machine wash warm do not bleach tumble dry low Made in USA