The BBB Cycling Impulse PH glasses have been redesigned; the frame and lens have been enlarged for a much better field of vision that is opened up because you hardly see the frame or the edge of the lens. The photochromic lens that has been used, automatically changes when weather conditions change. For example, the lens darkens as the sun gets brighter, and becomes more transparent when it gets dark outside. As a result, you don't have to change lenses during cycling! But if your lens needs to be replaced or if you want a different lens colour, the magnetic mechanism makes it easy to swap them. To ensure that the glasses stay in place, you can adjust the nose bridge slightly for a customisable fit. The frame itself is made of polycarbonate, which is lightweight and impact-resistant. The lens is made of Grilamid material and, therefore, practically unbreakable; you can rely on it to stay in one piece in the event of a crash! The BBB Cycling Impulse PH glasses also come with a hard case for safe storage.