Perfect for travel or being on your feet all day. Compression rating: 20-30 mmHg. This knee-high Marathon sock offers true graduated compression, increases blood flow, and allows you to perform at your peak, recover faster and feel better sooner. The advanced design supports critical muscles and tendons, while wicking moisture for a comfortable fit that goes the distance. Fabric and Care: Proprietary blend of polyester, nylon, and spandex. Made in USA. -Machine or hand wash cold. -Line dry. -Do not iron.