3M Half Facepiece Reusable Respirator - SmallHalf Facepiece Reusable Respirator Advanced silicone material for increased comfort and durability 3M Cool FlowTM Valve for cool, dry comfort Dual mode head harness that adjusts easily so users can wear the respirator in either standard or drop down mode For use with 3M Cartridges 6000 Series, 3M Filters 2000, 2200, 7000 or 5000 Series, or 3M Dual Airline Systems against a variety of gases, vapors and particulate hazards according to NIOSH approvals