Our all natural alpaca knee high socks are made from 80% alpaca, 15% nylon, and 5% spandex. Nylon and spandex added for increased durability and shape retention. Alpaca fiber is perfect for socks because it is extremely soft, like cashmere, and warmer than merino wool. Alpaca fibers are hollow which makes it a better insulator. As with all our socks, these are made in our sock mill on our Pennsylvania farm. Being knit from a natural fiber, these socks naturally wick ay moisture, keeping skin dry and cozy. This special wicking ability keeps you warm in winter and cool in summer. Their all terry construction provides extra shock absorption for your walking and hiking pleasure. All our socks are designed by a podiatrist to assure you receive the best design for comfort and foot health. Care instructions- Machine or hand wash cold water, air dry. No chemical dyes used with these socks.