Serengeti Sunglasses Cetera 7340 Dark Tortoise Brown Drivers Polarized Photochromic ChromaPop Bronze Brown Mirror the P8939 offers unbeatable comfort BV RX 4149KB 5412 54#ET the P8939 offers unbeatable comfort and sculpted temples provide stability 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