STRINGENT TESTING : Our masks have gone through numerous stringent tests, including ones from Nelson Labs USA and received very high marks. They have Particle Filtration Efficiency that rates over 98 percent ( Study report# 1383796-S01 ) Please see attached report for detailed information. NELSON LABS USA PROVEN : Our masks are very effective against airborne and fluid particles larger than 0.1µm ( Study report# 1383796-S01 ) ADVANCED 3-PLY TECHNOLOGY : Our masks are made with best in class materials and consist of 3 layers of advanced protection. They are made with high quality non woven fabric and the inner layer is very soft and comfortable to wear. ( These are not medical / surgical masks ) TRUSTED BRAND : We are a leading provider of healthcare products in the New York Tri-state area. We are located in Maspeth, New York.