Wigwam Unisex Cool-Lite Pro Quarter Length Sock 100% Acrylic Made in US Machine Wash 55% Coolmax Polyester, 25% Stretch Nylon, 10% X2O Acrylic, 10% Lycra Spandex Elasticized arch panel and seamless toe closure make this sock a great athletic sock "Y" heel pocket Machine wash warm do not bleach tumble dry low Made in USA