Wigwam Ironman Lightning Pro Low-Cut Sock 100% Acrylic Made in US Machine Wash 40% stretch nylon, 34% olefin, 22% X2O acrylic, 2% stretch polyester, 2% spandex Seamless toe closure Breathable mesh instep, patented moisture control system reduces blisters, foot hugging fit Machine wash warm do not bleach tumble dry low Made in USA