The Dynarex Basic Quick-Release Head Immobilizer (5/Case) (#5629) is a light-weight yet durable head immobilizer that's water-resistant and provides buoyancy in water rescue, as well as being compatible with backboards and extrication devices. The head immobilizer doesn't wrap fully around the head, which makes it ideal for patients who may be claustrophobic. Each head immobilizer is individually sealed.