Lens The Fototec Light Night lens has an adaptive coverage with a light transmission that ranges between 27.7% and 75.9%. The lens will automatically lighten in darker light conditions and darken in lighter light conditions. For great impact resistance the lens is constructed from polycarbonate which also shields from 100% of harmful UV rays. Integrated vents boost airflow to stop the lens from fogging up. Frame The Aethon frame is crafted from Grilamid TR90 which keeps the sunglasses light, flexible and rugged. For a comfortable, bespoke feeling fit the nose and ear pieces are adjustable and are coated in a, specialised, hydrophilic rubber for added grip. The frame is best suited to large and extra-large face shapes.