Sockwell Women's Lucky Stripe Socks Wool 30% / Bamboo Rayon 30% / Nylon 35% / Spandex 5% Made in the USA and Imported 30% Merino Wool, 30% rayon made from bamboo, 35% Stretch Nylon, 5% Spandex Turn welt top, y-heel and cushioned sole. Arch support and flat toe seam. Machine wash warm, turn sock inside out. Tumble dry low. Do not bleach. Made in the USA