Serengeti 7926 Brera, Sanded Dark Brown Frame, Polarized Drivers Lens plastic frame photochromatic lens Polarized Lens width: 62 millimeters Bridge: 15 millimeters Arm: 135 millimeters 3" high 3" wide Adaptable lenses are the preferred choice by drivers and pilots Photochromic lenses allow the eye to experience enhanced contrast Darkening in bright sunlight and lightening in overcast conditions Serengeti lenses react to UV light by adjusting to the changing light