Sockwell Women's Independence Day/San Fran Cable 2-Pack Socks 100% Nylon 32% Merino Wool, 32% Bamboo Rayon, 31% Stretch Nylon, 5% Spandex Spandex throughout the sock Arch support and flat toe seam. Machine wash warm, turn sock inside out. Tumble dry low. Do not bleach. Made in the USA