Injected molded from high-density polyethylene plastic resin. Patented pre-molded chin support. Multi-height adjustable collar. Florescent locking clips. Rear ventilation panel. Enlarged trachea opening. Foam padding. Developed for emergency medical use. Flat one-piece design enables efficient storage where space is limited. Simply measure the patient, adjust and lock selected height and apply. X-Ray, CT and MRI lucent. Available in one size which fits most adults. Easy to apply and secure to the patient. Clean with mild soap and water.