This mask saver helps me re-use my KN94 masks. It's thin, just a little thicker than tissue paper. But I put it under the KN94 for hygeinic purposes and also on top so that my main mask stays clean a little bit longer. Of course, I have to do proper disinfection of the mask itself (i.e. steaming via microwave) and I only re-use it 3 times at most. But this product helps me save some money.
