Due to the scarcity of PM2.5 filters we have been asked to find a suitable material that can work as a replacement for the filter, we test it the pellon as a middle layer sandwich in beetween the outer layer and the inside layer of fabric, and it works, its breatheble, it can be washed.
This is NOT A FILTER.
THIS IS NOT SUPPOSSED TO PREVENT ANY VIRUS OR DISEASE.
THIS IS JUST AN OPTION TO OFFER A BIT MORE PROTECTION.