A Backpacker Magazine Editors' Choice Award winning product, and for good reason. There are a whole lot of features, packed into the Fox River X-Static Liner Socks. Silver fiber construction regulates temperature and is anti-microbial to inhibit odor and bacteria. Ultra lightweight and smooth, to fit nicely under your outer hiking socks.Backpacker Magazine Editors' Choice Award winning product. Contains all-natural silver-coated nylon fiber to provide odor protection, comfort and anti-microbial properties. Silver X-static? fiber eliminates odor and inhibits growth of bacteria and fungi. X-static? transfers heat and regulates foot temperature, keeping feet cooler in summer and warmer in winter. No bulk smooth jersey knit design. Ultra lightweight. 60% polypropylene, 20% nylon, 19% X-Static? nylon, 1% spandex. Made in USA.