ASICS Hydrology Low Cut Running Sock (3-Pack) (Assorted,Large) 18% acrylic 45% Ultraspun Polyester 32% Nylon 18% Acrylic 5% Lycra Spandex Hydrology construction quickly moves moisture away from the skin keeping the foot dry, cool and comfortable. Selective cushioning in foot bottom, heel and through the tips of the toes, help provide impact protection. Machine wash warm, Tumble dry low, Do not bleach Made in the USA