Fox River Linea Women`s Ultra-lightweight Crew Socks, FR-4542, Medium, Navy 54% UltraSpun? polyester, 44% nylon, 2% spandex. Memory-knit construction holds shape, wash after wash. Reinforced toe and heel add comfort and longer sock life. Smooth, flat knit construction provides lightweight comfort. Smooth, flat toe seam adds comfort and durability. Made in the USA.