These disposable KN95 face masks are designed for superior fit and comfort in mind. Ideal for everyday protection against COVID-19 and other transmissible respiratory illnesses. The large exhaust valve vents out exhalations, allow fresh air into the mask with each inhale and minimizing the buildup of moisture and smells. This leads to a longer usable lifespan per mask when compared to basic three-ply and non-vented KN95 masks. When adequately stored, these masks have a shelf life of two years.