One of the models of the Driving Heritage Collection, BORON is inspired by the driving codes and free spirit mindset but with a retro twist. Its modern and dynamic design echoes the dramatic lines of old and edgy American cars from where their engines first revved to the American deserts and enduring the test of time. BORON benefits from a premium conception with the combination of handcrafted Acetate and premium metal to which the ultimate Serengeti mineral lenses have been added. A bold and asserted look, with the best visual acuity, for a limitless ride. The Purest Photochromic Polarized sun lenses. Photochromic lens perfectly adapting to only let the necessary light reach your eyes. Ideal for everyday use. Mix of robustness and adaptable materials for a solid and perfectly fitting frame.. The small yet robust hinge. Lens Technology : Mineral Polarized Photochromic Spectral Control. Lens VLT : 18% to 12%. Lens Color : 555nm. Frame Material : Acetate/Metal. Hinge : 3 Barrel Hinges