|| Smith Spoiler polarized sunglasses feature the new interchangeable Interlock lens system, an intuitive way to switch your lenses in any sport or lighting. With the new Interlock Interchangeable system, simply rotate a temple to slightly open and close frame for lens changing. Polarized lenses reduce 99% of visible glare for increased sharpness and decreased eye fatigue. Scratch- and impact-resistant Carbonic(TM) lenses use Tapered Lens Technology(TM) from Smith to provide distortion-free vision. Tapered Lens Technology contours the thickness of the lens so that light travels through without distortion-what you see is what you get. Frame includes 1 set of polarized lenses and 2 additional sets of lenses for a total of 3 sets of lenses. Black frames feature polarized grey lenses that block reflected glare while preserving natural colors in order to provide true color definition. Nonpolarized, additional lenses are ideal for low and medium light and nighttime. Grilamid(R) TR90 lightweight nylon frames offer a consistent fit and flexibility in all temperatures and are extremely impact resistant. Hydrophilic Megol(TM) temple pads become tackier when wet for reliable grip during exercise and hot weather. Includes protective case.