Serengeti Nuvino Sunglasses Photochromic and polarized properties are combined with lightweight polycarbonate, shatter resistant lenses with anti glare coatings, resulting in superior durability and clarity. This is the kind of treatment every driver deserves. Made from only the finest materials in the world, Serengeti's glass lenses provide unsurpassed visual acuity. And because the advanced technology is molecularly engineered into the glass itself, it does not wear out or wear off. In an age of disposables, our lenses can last a lifetime. Fits MediumLarge Lens Polarmax Drivers Made with polycarbonate, this versatile polarized and photochromic brown lens offers protection and clarity well beyond the standard. 18% transmittance lightened lens 9% transmittance darkened lens