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Protect yourself and those around you with our activated carbon face mask filters While wearing a mask made from fabric is useful to an extent, you can almost triple their efficiency (from 28% to 80%) by adding one of our filters inside. Our mask filters are lab graded and certified to filter up to 98% of PM2.5 particles. These high quality PM2.5 HEPA mask filters are made with 5 layers of high grade materials, which protect you in different ways: The first layer of non-woven cloth blocks larger airborn particles, such as pollens. The second layer is made out of meltblown cloth, the same material used in respirators and surgical masks you’ve been hearing about. This material is very special because it blocks finer particles from coming in, while also allowing the air to go through, allowing you to breath. The third and middle layer is made out of activated carbon, a material used in a lot of mask filters for its efficiency in absorbing and clearing fine pollutants. The fourth layer is also made out of meltblown cloth, for any particles that would remain. The fifth and last layer which is closest to your mouth is made out of comfortable anti-static non-woven cloth Buy with us and enjoy quick and fast shipping right from the USA! If you are not satisfied for any reason, simply let us know and we’ll refund you, no questions asked