The Head Vise IV from Morrison Medical is a compact foam block head immobilizer that stores in a 1 1/2-x-5-x-15-inch space. When assembled, it has extra-wide 3-inch hinged head blocks. The Head Vise IV provides easy access to the ears and is universal, fitting most backboards. The cardboard base measures 5 inches by 15 inches. The product also includes blue all-weather straps.