Unisex Outdoor face mask with filter and valves

Brand new Unisex Cycling Mask with Activated Carbon Filters and 2 One Way Exhalation Valves on each side of the mask. Features: Changeable filter, PM2.5 active carbon filter to stop smog and haze effectively. Filters are good for 20 to 60 hours depends on environment the mask is used in. Dusty / woodworking / environments would get 20 hours per filter. Non dusty application would get 60 hours of use per filter. Both 2 sides of face mask have exhale valve