This full - face mask is maintenance - free and its ease of use and comfortable fit are sure to convince you. Its compact shape provides good visibility and its lightness allows you to work without getting tired. Its lens is generously sized and scratch - resistant. The 3M™ Cool Flow™ exhalation valve reduces breathing resistance and makes breathing particularly easy. The filter connection of the mask has many advantages: the two - filter system facilitates breathing and provides good weight distribution on the face. The bayonet connection makes it quick and easy to change filters, which can be chosen from the wide range depending on the intended application. The available sizes make it possible to adapt to different face shapes. 3M™ full face masks are tested and certified class 1 according to EN 136 standard. The level of protection of the mask depends on the filters used among the 2000, 5000 and 6000 series.