This one, fully-assembled collar easily adjusts to fit all adult patients. Simply measure the patient, select the size, adjust collar and lock. Uses the same sizing and application method as the original Stifneck® collars. ◊ Features: Allows easy access for pulse checks and advanced airway procedures. Oversized trachea hole improves visualization. Locks ensure selected size stays in place Has directions molded into collar. Radiolucent, and MRI and CT Scan compatible.