Bolle Kingsnake Sunglass Photochromic technology is embedded into the lens at a molecular level to automatically lighten and darken to the conditions Oleo phobic treatment on the outside of the lens, Dirt, grease and water spots, this coating stops it before it sticks to your lenses No fogging on your eyewear, Not only repels the fog that clouds your vision but is simply revived by an application of moisture