The Ambu Perfit ACE is the only adjustable one-piece, rigid cervical spine immobilization device with 16 precise settings for a customized fit . The Ambu Perfit ACE comes with a flip chin piece for flat storage and pre-shaped to fit the chin. The Mini Perfit ACE adjusts to virtually all infant, pediatric and small adult neck sizes with its 12 settings. The Mini Perfit ACE is perfect for small adults with thin necks. All Perfit ACE collars incorporate latches which allow the rescuer to size the collar accurately. Two safety buttons hold the collar in place for maximum reliability. The Ambu Perfit ACE is CT and MRI compatible and has a ventilated, posterior shell for fluid drainage. Comes with a comprehensive sizing system for easy and accurate sizing.