NIOSH approved to accept a wide variety of cartridges and filters. These half facepiece respirators are made with silicone to provide maximum comfort and durability. The valve design helps make breathing easier, and helps reduce heat and moisture buildup in the facepiece. Unique head harness design adjusts easily and user has the option of wearing the respirator in either traditional or “drop-down mode” (by detaching the neck strap, the respirator will drop down and rest on your chest). Designed to be used with 2000, 5000, & 6000 Series 3M cartridges, filters, adapters and retainers.