Oakley engineering takes performance to the next level and brings style along for the ride. The Oakley Flak 2.0 Sunglasses offer 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®Features:PRIZMis a revolutionary lens technology that fine-tunes vision for specific sports and environments. See what youve been missing. Click here to learn more about Prizm Lens Technology.The XL edition offers enhanced lens coverage and specialized lens curvature for protection against sun, wind and impactUnobtanium® earsocks and nosepads keep glasses in place, increasing grip despite perspirationPatented High Definition Optics® (HDO®) provides superior optical clarity and razor-sharp vision at every angleO-Matterstress-resistant frame material is both lightweight and durabl