Outstanding protection factor: Double layered face seal with triple sealing action, Two sizes in one mask - one size fits all, Proven quality & reliability: Proven quality under hardest conditions: used by fire brigades all over the world for decades, All parts available as spare part, Excellent field of vision as visor is close to the face. Requires only routine filter replacement and approved according EN136 class 3 and NIOSH 42 CFR, part 84