HUMMINGBIRD 3D Respirators contain a filter that protects against 99% of particles while being used in the general environment - at home, at work, and at school. FDA listed as a respirator, KF94 & CE Certified, our non-woven HUMMINGBIRD 3D Respirator has been tested with sodium chloride and paraffin oil to guarantee its effectiveness. Shaped in flat form, with a curved profile for eyewear and a soft inner shell HUMMINGBIRD 3D Respirators are safe and comfortable for daily use. HUMMINGBIRD 3D Respirator is certified for KF94 (Korea), CE FFP2 (Europe) and is listed as an FDA Class II Respirator(US).