• Soft silicone sealing surface designed for enhanced user comfort. • 3M Cool Flow valve helps release warm, moist breath from the inside. • Unique head harness design and optional adjustment strap for ease of use. • Compatible with most 3M filters of the 2000, 5000, 7000, and 6000 series. • Versatile protection against hazardous gases, vapors, and particles with the appropriate filters. • Product designed for industrial and professional use in the workplace.