Optic Nerve's unique 7 layer lens system provides a quality polarized lens with precision optics, superior clarity, incredible thermal stability, 100% UVA, UVB and UVC protection, and unbelievable abrasion resistance. Our advanced PRESS POLISHED forming process produces a super light lens with an exact, 100% uniform 6 or 8 base curvature. This process insures precision optics that exceed or rival the optics of virtually any lens on the market at any price. [Feel free to compare] All frames come with a lifetime warranty. Fits a wide range of both men's and women's face shapes GREAT PRODUCT, EXCELLENT VALUE