Have better visibility of what&';s happening below the water&';s surface with Boulders. Mirror lens reflect light from your eyes offering extra protection. Boulders Sunglasses Features: 100% UV protection Corrosion resistant polarized lenses with extra lens coating to reduce mirror lens flaking 1.0mm Triacetate (TAC) polarized lenses Fade-resistant frame Integrated hinge will stand up to repeated use Authentic Calcutta logo 1 year limited warranty (Formerly Shoal frame)