N99 Face Mask is an anti-Pollution mask with a filter efficiency of 99% which makes it best in its class. Rhysley N99 Face Mask is a highly comfortable mask with adjustable elastic headbands, it consists of an exhalation valve that helps in maintaining a cool flow of exhaled air hence making it comfortable for long hours usage during hot weather. It protects you from harmful dust, pollution, bacteria, and viruses to enter the body.