High performance CoolMax fibers and Wick Dry technology help these socks move moisture away from your skin just as fast as you can hike. Construction cushions and comforts with every step. Spandex compression arch holds form and adds support. Cushioned sole, heel and toe absorbs shocks and jolts. 50% Coolmax polyester, 25% cotton, 23%nylon, 2% spandex. Medium weight.