The Oakley Flak Jacket XLJ Sunglasses – Black Iridium Lens are for sport professionals who demand nothing less than the best. World-class athletes have driven Oakley to create innovation after innovation, including interchangeable lens designs with unbeatable optical clarity. Flak Jacket XLJ takes that to the next level with the latest in performance technology. Flak Jacket XLJ lets you change lenses in seconds to optimize vision in any sport environment. Multiple lens colours are available, and all lenses feature the unbeatable clarity of Oakley’s High Definition Optics (HDO).