KN95 face masks are made of two layers of non-woven cloth, two layers of melt-blown fabric, one of hot air cotton. The efficiency of our KN95 mask is over 98.1%. 3D shape design, high-elastic ear loops, and adjustable nose clip to ensure KN95 face mask a snug fit covering your face. Ear loops can extend from 3.8 inches to 7.8 inches in length. They are disposable face masks and cannot be washed. This safe mask can customize the logo to show your identity..