3M™ Secure Click™ HF 800 Series Half Mask Reusable Respirator helps protect against particulates and a wide variety of gases and vapours when used with approved 3M™ Secure Click™ cartridges and filters. Available in three sizes, our respirators come with an optional speaking diaphragm to help provide easier communication while you work. Breathability: Greater breathability and comfort provided by the world’s first quad flow cartridge system.