A super light-weight (only 4 oz.) foam-padded aluminum splint that can be unfolded and bent into almost any shape to conform to almost any part of the body (around the neck, at the elbow, etc.). Re-usable and transparent to X-Rays, which means it can be kept on during scanning. Every expedition doc and EMT crew packs one of these as a standard item. It's a great thing to have in your car's first aid kit, or at home, camp, or vacation where you have active people.