5-layer protective KN95 has a filter efficiency greater than or equal to 95%. FDA registered and CE approved, this mask features a comfortable ear loop, adjustable nose wire, 5 layers containing cotton, non-woven cotton, melt-blown fabric, and a hot air filter cotton. Its filter can block out harmful pollutants, viruses, bacteria, and droplets (non-oil). Uniquely shaped to fit all faces with excess space to breathe easily.