KF94 can effectively block the common carrier of viruses: droplets. Filter out fine particles including viruses, mold spores and asbestos. The 3D structure provides room for breathing so that it doesn’t touch the mouth and the design is created to fit on the facial line in order to help prevent maskne with extended periods of use. ANTI-FOG, The nose clip inside each mask not only helps keep the mask situated nicely on your face, but also helps to minimize air leakage and the possibility of fogging up eyeglasses. Multilayer protection, can filter out dust, germs, smoke and almost 98 percent particles in the air.