The Julbo Ultra sunglasses are the result of collaboration with trail running and mountain biking pros. Thanks to the perfect hold on the head, light weight, and vented lenses you will feel that they have become a part of you. The Zebra lenses automatically lighten and darken in different lighting conditions and provide maximum coverage for protection and peripheral vision. Zebra lenses get lighter or darker in accordance with the intensity of the light Protection from cat 1 to cat3 extremely light to average darkness Lenses change in about 22 seconds Lenses block 100% UV ABC Anti fog coating Soft lens material reduces risk of injury in falls Frames are lightweight and durable Frames are designed for all day comfort, but a secure fit. Rubber nose pads and temple tips.