MSA offers choice of two facepieces, the proven Ultra Elite facepiece or the new industrial Advantage 4000 facepiece for the PremAire cadet respirator. Three facepiece sizes (small, medium or large) in either Hycar or silicone rubber. Nosecups are available in two sizes, standard and large. Available adapters to convert the Advantage facepiece to a twin-cartridge respirator (using Advantage Cartridges) or an RD40 Facepiece. A one-way check valve preventing exhaled air from entering the mask-mounted regulator. A rugged polycarbonate lens with scratch-resistant coating. Four-point silicone head harness for exceptional comfort and security. Optional polyester net or Kevlar net head harness.