Serengeti GabrielaShiny Dark Tortoise / Polarised Drivers LensesGabriela blends Serengeti's craftsmanship and style with the designer's famous lens technology.And hidden in the temple is a spring hinge that offers comfort all day.The polarised Driver's lens also means you see things like traffic lights better. And that polarisation beats the blinding glare reflected from other vehicles.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 of glass, for the best optical clarity available, and UV400. Gabriela also comes with a one year manufacturer's warranty.