The Flak 2.0 XL sunglasses from Oakley feature 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. Patented XYZ Optics for razor sharp clarity and secure grip of Unobtanium complete the design.Enhanced lens coverage extends your peripheral view to improve protection against sun and wind. Impact Unobtanium earsocks and nosepads keep the glasses in place, increasing grip despite perspiration. Patented High Definition Optics (HDO(R)) provides superior optical clarity and razor-sharp vision at every angle.