Serengeti Sunglasses Cetera 7340 Dark Tortoise Brown Drivers Polarized Photochromic Grey to Clear Gradient Brown Mirror and the signature photochromic lenses Saturn Green 555nm and the signature photochromic lenses shift smoothly with changing light Marc Jacobs Sunglasses 096 S R6S IR Transparent Grey and Black Grey are a modern rectangle style crafted from lightweight acetate Serengeti Sunglasses Cetera 7340 Dark Tortoise Brown Drivers Polarized Photochromic are a wrap around sporty sunglass with a lightweight durable construction and this model has the standard Drivers lens which is the cornerstone of the Serengeti lenses range with the superb optical performance and Spectral Control given by the superb manufacturing technology used by Serengeti to make these amazing photochromic lenses