3M Secure Click Half Mask Reusable Respirator HF-800 Series is designed with smart and intuitive features 3M™ Secure Click™, HF-800 Series is simple, comfortable and reliable. helps protect workers from particulates and a wide variety of gases and vapours when used with approved 3M Secure Click filters and cartridges. Greater breathability and comfort provided by the world’s first quad flow cartridge system Push button seal check helps bolster confidence that the respirator is properly sealed to the face Speaking diaphragm is designed to help provide easier communication while you work Confidence that filters and cartridges are installed properly provided by all new Secure Click™ connection Low profile half mask design offers a wide field of view and compatibility with certain welding and grinding shields Over-moulded design for easy assembly/disassembly Advanced silicone material for increased comfort and greater durability Available in three sizes: small, medium, and large, respirators all come with an optional speaking diaphragm.