Neutrovis KF94 face respirators are designed to limit unfiltered air entry and securely fit your face. Its 3D design is tight-fitting and protective with the ease of breathability and communication. The side flaps stay flushed against your face and reduces the risk of the wearer readjusting their face mask. This provides a secure seal and double protection from all sides of the face mask. The face mask is made of double layered melt-blown filter fabric with ≥98% BFE (Bacterial Filtration Efficiency) and ≥98% PFE (Particle Filtration Efficiency) which works to block out bacteria, pollution, pollen and dust particles from your surroundings.