Sockwell Women's Marigold Socks 35% Stretch Nylon/ 30% Merino Wool/ 30% Bamboo Rayon/ 5% Spandex Made in the USA and Imported 30% Merino Wool, 30% rayon made from bamboo, 35% Stretch Nylon, 5% Spandex Fabric Type: 35% Stretch Nylon/ 30% Merino Wool/ 30% Bamboo Rayon/ 5% Spandex; Import Designation: USA Turn Welt Top Keeps Your Socks in Place Flat Toe Seam for Comfort Y-Heel Shape keeps Sock in Place Machine wash warm, turn sock inside out Tumble dry low Do not bleach