Serengeti Piero Sunglasses, Shiny Taupe Tortoise/Polarized Drivers Lens Small/Medium fit, Universal The amber-colored glass Drivers lens amplifies contrast and definition, delivering vibrant colors in all environments Our photochromic technology works by embedding molecules within the lens to constantly adjust to changing light conditions By managing colors within the visible light spectrum, Spectral Control technology gives you stunning, high-definition contrast and color enhancement Serengeti's polarization technology is specifically engineered to eliminate distracting glare, giving the wearer unsurpassed clarity and comfort