Driving in fog is considered to be the most dangerous weather hazard, especially if it is exceptionally dense fog or combined with other adverse weather conditions. Foggy conditions are the number one cause of large multi-car pile-ups. Anti-Fog Film will protect your mirror from blur. Shield and protect your rearview side mirrors from unwanted scratches, smears, dust, and dirt so as to keep your rearview mirror clear all the time. Just take a few minutes to install. Squirt a little water on the mirror, install the protective film to the mirror and adhere it, then flatten it with a small scraper, quick/easy/convenient.