The perfect add-on to your mask. Listing is for a single filter. Made of activated carbon and non-woven melt-blown filter cloth, the five-layer filter system effectively keep away from a range of airborne contaminants. Good for up to 70 hours of use.
Note: these filters do not block airborne Covid-19 particles. They do, however, add an additional layer of protection to your standard cotton masks recommended by the CDC for the general public.