Serengeti AerialShiny Gunmetal / Drivers Gradient Polarised LensesSerengeti's navigator-styled sunglass is extra light thanks to its titanium frames. This version, in Shiny Gunmetal features the contrast boosting Drivers gradient lens. Colours are enhanced too. You see things like traffic lights better. Serengeti's patented Spectral Control fine tunes light transmission so your eyes get the best clarity and colours available.Spectral Control also helps block most blue light – damaging to eyes and a cause of eye fatigue. And the photochromic lenses lighten and darken with the conditions, even inside the car where UV is minimal. Lenses are UV400 and Aerial comes with a one year manufacturer's warranty.