Unique head chin strap is designed to conform to patients forehead. Large ear holes for monitoring the patients ear canal. Minimal interference with X-Ray, MRI or CT scan procedures. Waterproof vinyl dipped foam makes it easy to clean. Compatible with all flat backboards. Compatible with spinal board and cervical collars.Head Immobiliser is simple to use, lightweight and easy to use. Composed of a universal attachment base and two durable head straps ,closed-cell foam head blocks, with one set of head and chin straps. The head immobiliser can be used on all standard backboards.