ASICS Microfiber Ultra Lite Low Cut Running Sock (3-Pack) 68% Microfiber Acrylic 30% Polyester 2% Lycra Spandex Microfiber high tech acrylic offers superior moisture management, is naturally soft to the touch, helps prevent blisters, and resists shrinkage and mildew. Mesh top construction enhances breathability and moisture transfer. Machine wash warm, Tumble dry low, Do not bleach Made in the USA