Ambu Mini Perfit ACE Extrication Cervical Collar Preformed Pediatric One Size Fits MostA dozen sizes in one collar: Ambu Mini Perfit ACE comes with a comprehensive sizing system for easy and accurate sizing; works for children but also for small adults with thin necks. Flip chin piece for flat storage and pre shape to fit the chin, and to facilitate intubation and removal of vomitus from the mouth CT and MRI compatible, and comes with a ventilated, posterior shell for fluid drainage