3M Ultimate FX FF-400 Series Full Facepiece Respirators• Engineered for maximum comfort, durability, and visibility• Provides rugged flexibility in extreme environments while still delivering superior comfort • The only respirator with Scotchgard Protector for easier cleaning and maintenance• Features soft yet durable silicone faceseal and head harness• Long-lasting head harness – straps pulled over one million times in durability testing• Low profile bayonet cartridge attachments, designed for improved balance and better weight distribution.  • NIOSH approved