Hot Shield Model HS-5 is an extremely heat & flame resistant respirator housing for the Drager Xplore 3500 Half Face Respirator. The HS-5 has been designed for firefighters in wildland/brush firefighting operations, yet will work in any thermal challenging environment. The HS-5 is constructed of CarbonX, the only inherently non flammable fabric in the world. This combination offers a high degree of filtration, the ability to fit test individuals and extremely efficient air exchange. You can purchase individually or both items together as a kit. This combo is small and very light; a real plus for wildland firefighters who have to carry so many items these days.