British technology from the Ministry of Defence. N99 certification guarantees consistent filtering of more than 99 percent of particulate pollution including PM10, PM2.5 and even PM0.3. Atlanta Healthcare Cambridge masks are treated with silver which also protects you against the build of germs after long hours of usage. Atlanta Health Care Cambridge masks are powerful respirators that not only clear the air of pollution via the particulate filter, but also remove potentially harmful pathogens with the additional carbon filter. Adjustable nose clip that fits the face and helps to prevent pollutants from leaking into the mask. Available in various sizes like extra small, small, medium, large and extra large. Multiple layers of protection. Easy and convenient to use.