Woody Knows brand nostril filters - can they protect you from Covid? I tested them with a PortaCount mask fit testing machine to find out. : r/Masks4All
WoodyKnows Replacement Filters for Gas and Pollutant Reducing Nose/Nasal Filters 12-Count,Anti-Allergy Products
WoodyKnows Gas and Pollutant Reducing Nasal Filters,Anti-Allergy Products