Utilises all of the 3M™ 2000, 5000 and 6000 Series Filters. Soft silicone material provides unparalleled wearer comfort. 3M™ Cool Flow™ Valve provides easier breathing and reduced heat and moisture build-up. Twin filter design for even distribution of weight and minimal obstruction to field of vision. Unique 3M™ Bayonet filter fixing system. Unique head harness and optional drop-down strap design provide greater stability, an increased level of comfort and ease of use. EN 140