Bertoni Photochromic sunglasses: the line of photochromic sunglasses is equipped with anti-fog photochromic lenses that, with the increase and decrease of UV exposure, tend to darken or lighten automatically, always ensuring excellent visual performance. Photochromic lenses protect your eyes every day, in the presence of the sun, the sky is overcast or intermediate weather conditions. The same lenses are demisters, treated with a special resin capable of dispersing the condensation that forms on the surfaces of the lenses in the transition from hot to cold. The reaction times of the photochromic lenses are very fast: only 8 seconds to go from light to dark, and 35 seconds from dark to light. The frame of the sunglasses of this line is in nylon foam, a plastic material with high impact resistance. Most of the photochromic sunglasses Bertoni have interchangeable lenses making it easier to change lens in case of wear. nuovo ALIEN , montatura in TR90 LX composta per il 70% da nylon e 30% da carbonio. Le lenti sono realizzate in PC antiurto da 2,2mm di spessore, fotocromatiche e con trattamento antiappannante. Lens technology Photochromic Lens Lens color Photochromic from clear to dark Frame color Shiny black Weight 16 gr. Frame's curving 6 ADDITONAL LENS no.