Oakley 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. The Holbrook OO9102 by Oakley includes the guarantee and sunglasses pouch. Safe and ultra-fast lens replacement with Switchlock interchangeable lens technology Lightweight O Matter frame with metal ellipse Unobtainium terminals and nose pads for greater comfort and top performance High-performance single-lens technology Oakley with HDO Available with Prizm lenses that enhance color, contrast and detail while optimizing the viewing experience Available with polarized lenses and Iridium Compatible with Oakley prescription lenses Hard protective case included