Alpaca Boot Socks are soft, warm and super comfortable. Once you wear alpaca socks, you'll never want to wear any other socks. Alpaca is a rare specialty fiber. It is one of the softest fibers in the world, it is hypoallergenic, and much warmer than wool. Alpaca is a hollow core fiber so it traps a lot more air than wool (which is a semi-hollow core fiber). This gives the alpaca a much higher insulation value making warm and toasty even on the coldest days. Give your feet a little loving! Machine wash and dry.