Fox River Fatigue Fighter socks have 8-15mmHg graduated compression for improving circulation and reducing swelling. The cushioned sole and shin absorbs impact and the reinforced heel and toe help you get the most miles out of your socks. These socks use Wick Dry technology to pull moisture away from your skin and Scentry technology to resist odor. Fox River socks are guaranteed against manufacturing defects for 1 year and are proudly made in America. Specs: 60% polyester, 35% nylon, 5% spandex