Give harmful pathogens the blind side with our Blind Side Reusable KN95 Face Masks. Each reusable KN95 masks comes equipped with 2 filters and the filter element can last up to 10.5 months and the masks can be reused continually over 3 years.Mask Care:Care for face mask is easy just rub exterior with alcohol solution everyday after use.After 10 months you can remove filter element and boil in hot water for 2 to 3 minutes. Let stand for 1 minute after removing from hot water and the add new filter element. It's that easy.