Proven to be 100% effective in occluding blood flow in both upper & lower extremities by the U.S. Army’s Institute of Surgical Research, the CAT (Combat Application Tourniquet) is the go-to device for life-threatening injuries to extremities while in the field.
You can operate this tourniquet effectively with just one hand and it can be applied to legs or arms. Reinforced windlass clip & highly visible security tab includes a writeable area to record the time of application.
BEWARE... The CATs you find at Omega Survival are authentic North American Rescue products, the contractor which works with the U.S. military. You will see "sales" on tourniqets which claim to be CATs on places like Facebook, but I assure you they are Chinese fakes -- the windless (ratcheting stick) is known to break off while in use.
If you want real, high-quality CATs (and other medical devices), Omega Survival promises to never carry such products on which your life depends just to make a few bucks.