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. 67% polypropylene, 25% nylon, 5% X-Static® nylon, 1% spandex. Made in USA.