Glasses designed for cycling, also suitable for other speed sports. The lens used in this model darkens and lightens according to the surrounding lighting conditions, and its light transmission varies between 17% - 75%. The lens model is called "Light Amplifier", and it is the lightest of the manufacturers three photochromic lenses in categories 1-3. - Reactiv Light Amplifier cat1 ... cat3 lenses - Extremely wide field of vision - Design works well with a cycling helmet - 3D nose bridge - Ventilation holes reduce fogging - Flex3 temples can be shaped to fit your head Julbo has been manufacturing sunglasses for 135 years. By choosing Julbo, you are investing in quality, and complete UV protection is guaranteed.