FootSmart Men's / Women's Arch Support Crew Socks 2% spandex Y-gore heel with contoured heel and toe pockets prevent bunching and irritation. Low-profile toe seam won't rub your toes. NanoFlon fibers in high stress areas reduces blistering and chafing and provides superior abrasion resistance for durability. 39% nylon, 26% cotton, 26% acrylic, 7% polyester, 2% spandex. Made in USA. Care: Machine wash in cold water. Tumble dry low heat. Only non-chlorine bleach when needed.