Reliable 3-layer structure; This is an eco-friendly mask that uses FSC forest certification paper on the outside. We donate a portion of the proceeds from each purchase with a green fundraiser. Over 99% of test results. 1. BFE Bacteria Splash Filtration Efficiency Test 2, VFE Virus Splash Filtration Efficiency Test 3, PFE particulate filtration efficiency testing 4, Pollen particle collection filtration efficiency test; Material: Main Body/Filter Part: Polypropylene; Ear Strap: Polyurethane, Nylon, Nose Fitter Part: Polyethylene; Outer: FSC Forest Certification Paper; Size: Approx. 6.9 x 3.7 inches (17 mm) x 3 mm) Packaging changes. in some cases.