Labratory tested and combat proven, this true, one-handed tourniquet has been proven to be 100% effective by the U.S. Army's Institute of Surgical Research. The durable windlass system with patented free-moving internal band provides true, circumferential pressure to the extremity. A unique, dual securing system avoids the use of screws and clips that can be difficult to operate under survival stress or where fine motor skills are compromised.