Gas mask is made of thermoplastic elastomer material, soft in texture, comfortable to use, with an ergonomically designed sealing surface that fits different face shapes; MSA 10120785 Advantage200LS Type Half Mask Respirator * Medium Size (Old Number 815444) Gas mask is made of thermoplastic elastomer material, soft in texture, comfortable to use, with an ergonomically designed sealing surface that fits different face shapes; MSA 10120785 Advantage200LS Type Half Mask Respirator * Medium Size (Old Number 815444) Gas mask features MultiFlex design, providing even contact pressure during wear, stable use, and preventing mask collapse; The filter adopts a plastic shell, lightweight, does not obstruct vision, and meets environmental requirements.