Cheap Oakley Flak Jacket Sunglasses take performance to the next level and brings style along for the ride. The Oakley Flak Jacket enhanceds lens coverage, and every millimeter of the lens is optimized with high definition optics in a ruggedly durable yet lightweight design. Oakley fine-tunes vision by emphasizing colors where the eye is most sensitive to detail. The Flak is designed to push your limits with patented XYZ optics for razor sharp clarity and secure grip of unobtanium. They were created for world-class athletes, those who see the limits of possibility as just another challenge.