ASICS Women's Sorbtek Double Tab Low Cut Running Sock (3-Pack) (Assorted,Medium) 37% Nylon 31% Tactel Nylon 29% Sorbtek Polyester 3% Lycra Spandex Sorbtek yarns provide stain protection, shrink resistance, and breathability. Double tab design provides superior ankle fit and helps protect blistering during physical activity. Machine wash warm, Tumble dry low, Do not bleach Made in the USA