Note: Vent valves are not permanently attached. They are attached by being snapped on and off. If the vent valve de-attaches then you just need to unsnap the valve and then snap it back onto the mask. These masks are recommended to be hand washed due to the vent valves, which will help mitigate the problem of the valves de-attaching, if washed gently. 2 of the layers are behind the vent valve so you and others around you are still protected (compared to similar vent valve masks with open airways and no extra layers) Additional Details ------------------------------ Department: unisex-adult