100% PVC-free. Soft, durable facepiece. Extra-wide sealing surface. Seals comfortably to face. Exhalation valve positioned for better communication. Low profile for wide field of vision. Cartridges have a snap-in mount for easy replacement. New inhilation valve on each cartridge. Fewer replacement parts. Living hinge allows head harness to be folded comfortably around neck when not in use.