MSA Medium Advantage 4000 Twin Port Facepiece With Nosecup is made of silicon, hycar material and reduces fogging in low-temperature or high-moisture environments. Facepiece includes bayonet adapters in lens, net head harness and is used in agriculture, construction, electric utility, mining, sanding & grinding and welding. It is comes in three standard sizes for a comfort fit. It works with 3 different interfaces - push to connect, RD40 and twin-cartridge adapter.