The innovative 3M™ Secure Click™ platform features a quick, simple cartridge/filter connection. It works just like a seat belt. Simply align the connections and push until you hear a click and feel confident that filters are installed properly. Two dual-flow cartridges on each respirator combine to create four airflow paths in the world’s first quad-flow cartridge system, providing great breathability and comfort. These cartridges are compatible with the 3M™ Secure Click™ Reusable Respirators HF-800 Series and FF-800 Series. Easy breathing: 3M™ Secure Click™ Gas & Vapor Cartridge with Particulate Filters are designed to balance breathability and long service life. Gas and vapor cartridges use carbon particles to adsorb contaminants, filtering the air that you breathe. 3M has designed the cartridges to be easy to breathe through and long lasting by optimizing the layers and depth of the