A KN95 mask is a type of respiratory protective device designed to achieve a close facial fit and highly efficient filtration of airborne particles. It features a five-layer structure made of non-woven fabric, melt-blown fabric, and hot air cotton, offering protection against dust, pollutants, and harmful particles. The mask filters at least 95% of airborne particles, including viruses, bacteria, and droplets, making it effective for personal protection in various environments. KN95 masks are designed with ear loops and a nose clip to ensure a secure and comfortable fit. They are widely used in healthcare settings and by the general public for protection against COVID-19 and other airborne diseases.