The disposable KN95 mask is intended to filter out 95% of NaCl particles with a mass median diameter of 0.6 micrometers. Therefore, the mask can keep you safe from air pollution, dust, odors, pollen, smog, etc. It features a four layer filtration barrier. The high-quality elastic loops allows the mask to be easy to wear/take off, harder to slip and flexible with faces of different shapes.