If you’re pulling out a tourniquet, big trouble has already found you. Once maligned, tourniquets are back in regular use because nothing stops arterial bleeds faster than a tourniquet. To be clear: Only apply a tourniquet when the other option is death. Tourniquets completely cut off blood supply to the distal side of an injury, meaning you’ll lose the limb. Good tourniquets are quick to apply, hold fast, and are thick enough to keep from damaging or digging into the skin. Tourniquets are uncomfortable by design and do not relieve pain. Their chief function, and they do it well, is to stop an arterial bleed to save the victim’s life.