Sport professionals demand nothing less than the best, and Oakley has answered their challenge for decades. World-class athletes have driven them to create innovation after innovation, including interchangeable lens designs with unbeatable optical clarity. Flak Jacket sunglasses take that to the next level with the latest in performance technology.The Flak Jacket lets you change lenses in seconds to optimize vision in any sport environment. Multiple lens colors are available, and all lenses feature the unbeatable clarity of Oakley High Definition Optics (HDO). You can also choose the nose pads that give you the best fit, because two sizes are included with every frame. Pure Plutonite lens material filters out 100% of all UV, and meets ANSI Z87.1 standards for impact protection.