These sport socks are perfectly engineered for the demanding adventurist. The alpaca fiber evaporates moisture, keeps feet dry, & prevents fungal growth. Light weight on the legs, they have spandex in the entire sock for a perfect fit & comfortable wear. Alpaca cushioning on the sole, heel, & toe provide back support during sport activities, while special mesh stitching promotes air flow, keeping the feet dry. Ideal for all outdoor sports, any time of the year! Made in the U.S. In sizes S (Women’s Shoe Size 4-6.5), M (Women’s 7-10, Men’s 6-9), L (Women’s 10.5-13, Men’s 9.5-12), & XL (Men’s 12.5+).