Product details:

engineering takes performance to the next level and brings style along for the ride. Flak 2.0 offers a standard size frame with enhanced lens coverage, and every millimeter of the lens is optimized with High Definition Optics in a ruggedly durable yet lightweight design. Designed to push your limits with patented XYZ Optics for razor sharp clarity and secure grip of Unobtanium. Prizm LensesPrizm is a revolution in lens optics built on decades of color science research. Prizm lenses provide unprecedented control of light transmission resulting in colors precisely tuned to maximize contrast and enhance visibility.