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These masks are made with a double layer of fabric that is also interfaced to reduce micron size of particles able to pass through the fabric. In addition to the double layer, we provide a pouch you can put in stronger filter materials, such as cut up vacuum bags which were shown to be as high as 90% effective against .02 micron materials passing through it. These masks come with 2 5" fleece squares as a filter that can be reused and washed as well. To learn more about materials and how they do against small particles visit Smart Air Filters's Blog that answers your questions. Please also review the CDC's guidelines on cloth masks.