Style: Delio Resolutely modern and dynamic, DELIO, with his versatile design, will fit urban escapades as well as wilder getaways. Frame: Shiny Honey Lens: Mineral Polarized 555nm Cat 3 to 3 Our mineral lenses are made with borosilicate optical glass, from Corning®. A full 20% thinner and lighter, our Borosilicate mineral glass lenses are finer than any other lens. Produced in the same process normally reserved for ophthalmic-quality corrective lenses, they provide the best visual acuity you could ever experience. Every pair of Serengeti® mineral lenses is unique: each Photochromic lens passes through a Hydrogen-fueled Lehr furnace, which activates the Spectral Control® technology - with varying temperatures that determine the proprietary lens hue. They are also chemically tempered to ensure scratch and impact resistance. To complete this unrivalled visual experience, an anti-reflective coating is added to the backside of the lens, canceling the scattering light that causes reflective glare.