Locks ensure selected sizes stay in place. Adjustment tracks ensure symmetrical alignment of size. Uses the same sizing and application method as the original Stifneck collars. Easy access for pulse checks, advanced airway procedures, and visulaization through oversized trachea hole. Room for large fingers to slide through the rear panel opening for cervical palpation. Directions molded into collar. Reduces inventory costs and saves space. Madiolucent, MRI and CT scan compatible. Universal, Each.