The highly popular Fury model is equipped in this version with a lens that transitions from virtually clear to highly protective. This means you can put the glasses on in the early morning twilight, and as the day brightens, the lens reacts by darkening to the equivalent of regular sunglasses. The two first photos demonstrate this scale well. - Lenses made from Trivex plastic - Visible light transfer 12 ... 87% - Anti-fog treatment on the inside of the lens - Air Link temples help the glasses stay firmly in place thanks to the elastomer material - Grip Tech coating on the temple ends - Extra-wide field of vision thanks to Panoramic View design - Ventilation openings between the lens and the frame Julbo has been manufacturing sunglasses for 135 years. By choosing Julbo, you invest in quality, with guaranteed complete UV protection.