Reflective & Protective
Mirror coatings (also called flash coatings) are highly reflective coatings applied to the front surface of sunglass lenses to reduce the amount of light entering the eye. This makes them especially beneficial for activities in very bright conditions, such as hiking, skiing or snowshoeing at high altitudes.
These coatings can block an additional 10 percent to 60 percent of visible light for greater comfort in highly reflective full-sun environments.