Check the listing for details. First Defense Nasal Screens 4 Set (Small-Medium-Large) 7 pairs - 1 month supply. Condition: New. Listed at 143.40 USD. First Defense screens have been recently proven to reduce particulate air matter >90% at 1(µm) and > 99% at 10 (µm) or higher (which covers most flu respiratory droplet sizes, thus greatly reducing exposure to airborne droplets and many types of flu). We are surrounded by trillions of microbes that can cause us harm through infection, respiratory damage, and disease Learn how our solution protects you from the air you breathe.We can't risk the exposure a virus can bring and the harm it causes. Reduce your riskAllergies can stop you from living your life and being comfortable. Breathe easy nowGerms and bacteria are everywhere. Now you can filter your exposure.All natural Light weight, no need to insertEach individually sealed package includes 7 sets. Each set will last up to 24 hours of useLatex free, hypo-allergenic, non-visibleHelps alleviate respiratory suffering by comfortably filtering inhaled air and removing airborne germs, allergens and/or noxious particlesGreatly reduces inhalationThe Nasal Screens are as effective as a mask but so comfortable and discreet you can wear them anywhere.Made of 100% breathable non-latex, skin safe material, they will not clog and will seal 100% of the nasal passage, so the compliance rate has shown to be over 77% versus the less than 30% that the dust mask has shown.Designed to help protect against foreign airborne particles that find their way into nasal passages.Peel and stick, don’t get sick Sizes: Small (Children prefer 70%) 7 pairs 4 PackageMedium (Women prefer 70%) 7 pairs 4 PackageLarge (Men prefer 70%) 7 pairs 4 Package