|| The Smith Backdrop polarized sunglasses incorporate sharp styling and thoughtful details. They're an easy choice to be your single pair of sunglasses for sun protection. Polarized lenses reduce 99% of visible glare for increased sharpness and decreased eye fatigue. Lightweight Techlite(TM) lenses feature high-quality borosilicate glass that is polished and chemically tempered for increased shatter resistance. Frames feature polarized brown lenses to eliminate glare and enhance contrast while maintaining accuracy of color transmissions. Grilamid(R) TR90 lightweight nylon frames offer a consistent fit and flexibility in all temperatures and are extremely impact resistant. Frames feature spring hinges to accommodate a multitude of head sizes. Nosepiece and temple ends become tackier when wet for reliable grip during exercise and hot weather. 8-base-curve lenses; (the higher the number the more curved the lens-Smith features sunglasses with 6, 7, 8 and 9 base curvature). Sized to fits medium faces. Smith Backdrop polarized sunglasses include a protective case.