1.Our KN95 Face Mask is KN95 and European FFP2 certified, similar to the American N95 certified mask. 2.KN95 is an industrial manufacturing standard meaning our masks are effective against 95% of particles with a mass median diameter of 0.3 micrometers or larger. Properly worn masks can protect very well against PM10, PM2.5, and smaller particles. 3.BFE>95% (Bacterial filtration efficiency). 4.This mask features an Exhalation valve that can useful in dissipating humidity, heat, and carbon dioxide from the inside of KN95 respirator facepiece and decrease exhalation resistance, making the respirator more comfortable and less demanding for the user to breath. Product Features 5-LAYERS OF PROTECTION Not-woven Outer Layer + Filter Paper Layer + Skin Friendly Not-woven Inner Layer.Breathable And Comfortable,Low Breathing Resistance. COMFORTABLE HEAD-LOOP Comfortable head ear-loop, extra-soft head loops eliminate pressure to the head.You Feel Comfortable With Periods Of Time Usage.this Disposed. HIDDEN NOSE STRIPS Inset With Bendable Metal Nose Strips Freely Adjust Shape According To Face Shape,Increase Facial Fit,Adjustable According To Nose Height. BETTER PROTECTION Perfect when travelling through congested airports, bus terminals, malls, parks , and busy city streets.