Super soft merino wool provides itch-free comfort and moves moisture away naturally. Spandex arch brace for support and snug fit. Fully cushioned for long in-the-boot comfort. Smooth linear looped toe seam for no irritation at toes. Reinforced toe and heel for comfort and longersock life. 75% merino wool, 24% stretch nylon, 1% Spandex. Medium weight.