KN95 Respirator Face Mask is comfortable to wear and has an excellent filtration system against viruses, bacteria, germ, and harmful airborne substances. One of the most comfortable masks on the market. The filteration system allows exhaled air escape so that the face area and glasses do not over-heat or fog-up. These masks can be used for an entire day rather than changing the 3ply disposable ones constantly. You could reasonably get a few days use out of this KN95 before disposing it. You can not wash this mask.