6 Cloth Face Mask Filters You Can Order Online | Real Simple
Jun 24, 2020·The most important factors to look for when buying filters for face masks are layers and high quality materials. Dr. Kesh recommends buying filters that are N95- or KN95-grade now that many are available online. The only caveat is that filters are supposed to be changed daily. “A standard filter is really best if used only once,” says Dr. Kesh.