Don't be fooled by cheap Amazon imitations, this is the Official tourniquet of the US Army
The Combat Action Tourniquet is the recipient of the "Top 10 Greatest Inventions" Award by the U.S. Army. Testing by the U.S. Army Institute of Surgical Research found the C-A-T be 100% effective in stopping blood flow in both the arms and legs.
After feedback from users, the C-A-T® GEN 7 has been re-designed, making it the most effective C-A-T. The new GEN 7 is simpler to use, with a single application protocol, single buckle routing system.