The Leech H4X sunglasses are equipped with Photochromatic Active2Dark lenses that adapt to the current light conditions. When the sky is clear and UV radiation is at a significant level, the lenses turn darker. The lens color is restored when conditions become darker, and the lenses react quickly to changes without stressing your eyes. Once you have tried a pair of glasses with photochromatic lenses, you will wonder how you ever managed without them! Specifications: • Photochromatic lenses that adapt to light. The ACTIVE2DARK lenses of Leech are among the fastest reacting lenses on the market, so you can be sure of the quality and sharpness of these glasses in varying conditions • The lenses are 100% polarized and UV protected.. The high-quality ear pieces provide good cover against sideways light. • The Day model is perfect for clear weather, but it is also great in cloudier conditions. A perfect option for boating and fishing! • UV-protective coating UV400 . The coating prevents UV radiation from the sun from damaging your eyes. 100 % protection against UVA, UVB, and UVC • Comes with a protective case and a piece of microfiber cloth