Sundog Bomb Mela Lens Chromo Frame Sunglasses 8 Base Distrortion Free SD-C7 Lens MaxFlex RILSAN Frame Megol Co-Injected Temple Tips Megol Nose Pads Sundog Mela Photochromic features embedded halide technology that reacts to ultraviolet light intensity which causes the lens to gradually darken or lgihten based on UV intensity