Details: The Serengeti Nuvino combines lightweight, all-day comfort with excellent durability. Plus, its flexible fit cradles the contours of your head while its rimless design gives you a full field of vision through the photochromic Polar PhD lenses. Using only the highest-quality injected nylon for superior durability, these fashionable frames have the added benefit of being exceptionally light, chemically resistant, extremely flexible and comfortable.