Photochromic and polarized properties are combined with lightweight NXTreg, shatter resistant lenses with anti glare coatings, resulting in superior visual acuity and performance. The exclusive Polar PhD153 lens technology is available in Serengetireg Driversreg and CPG153 Cool Photo Gray lens hues. Polar PhD CPG Lens Serengeti's Polar PhD153 lens is built upon the NXTreg platform and is exceedingly lightweight, retaining all the technology you'd expect from Serengeti and more. Polar PhD153 lenses deliver the latest in polarization, photochromic technologies, exclusive hues and high definition benefits that are near glass in quality. What's more, Serengeti's Advanced Polarized Surface Technology153 has been engineered into the backside of the lens to avoid the delamination and deterioration inherent with film. The CPG, or cool photo gray lens, is ideal for all weather conditions, particularly harsh glare. With its exceptional polarization properties, it's c