PRIZM™ GOLF FLAK 2.0 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® FEATURES PRIZM™ is a revolutionary lens technology that fine-tunes vision for specific sports and environments The XL edition offers enhanced lens coverage and specialized lens curvature for protection against sun, wind and impact Unobtanium® earsocks and nosepads keep glasses in place, increasing grip despite perspiration Patented High Definition Optics® (HDO®) provides superior optical clarity and razor-sharp vision at every angle O-Matter™ stress-resistant frame material is both lightweight and durable for all-day comfort and protection INTEGRATED TECHNOLOGIES PRIZM™ Prizm™ 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. HIGH DEFINITION OPTICS® High Definition Optics® (HDO®) is a collection of patented technologies that allow Oakley eyewear to meet or exceed the testing standards of the American National Standards Institute for optical clarity, visual fidelity, and impact resistance. INCLUDED LENS SPECIFICATIONS   PRIZM GOLF PRIZM Light Transmission 30% Light Conditions Changing Conditions Contrast Increased Base Lens Color Ruby RECOMMENDED USE: Running, Golf FRAME SPECIFICATIONS FRAME FIT  Standard Fit 1 Lens Width 59 mm 2 Bridge Width 12 mm 3 Lens Height 38 mm 4 Temple Arm Length 133 mm *Measurements listed intended for customer use only. Not intended to be used by opticians to fill prescriptions.