Features: Replaceable filter, active carbon filter to stop smog and haze effectively.  Filters are good for 20 to 40 hours depends on environment the mask is used in. 

Dusty / woodworking / environments would get 20 hours per filter.  Non dusty application would get 40 hours of use per filter. 

Both 2 sides of face mask have exhale valve, no fogging glasses and effective heat dispersion  

Gender: Unisex / Men / Women / teens

Function: Anti-pollution, organic odors, dust, pollen 

Function: Suitable for dust, anti-vehicle exhaust, anti-pollen allergy,for cycling, hiking, skiing and other outdoor and indoor activities