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 Nose / Nasal Filter - Anti Allergies Sinusitis Allergic Asthma Rhinitis Nasal Nose Allergy [Size-IIIS] (20 Filters) - AliExpress