The Maxx Retro 2.0 is designed with fashion, function and the young spirit in mind...sleek, bold, full frames with the exclusive Maxx Thumb Notch. And, like almost every pair of 2017 Maxx HD Sunglasses, the Retro 2.0 is made from TR90 and includes our lifetime warranty against frame breakage. This pair is not only polarized, but sports the classic tortoise frame for class. High Definition lenses enhance contrast by reducing the scattered blue light that causes objects to appear flat against backgrounds. Contrast is improved so objects appear more sharply defined. Colors are bright and vibrant. Glare is virtually eliminated, allowing your eyes to relax and see everything remarkably crisp and clear. The HD lens cuts through haze and glare for optimum visual clarity, even at a distance. Sharpens contrast while maintaining a natural, no-distorted color balance.