It's always frustrating when the lenses of your favorite sunglasses get scratched and lose their transparency. Here, Predrox Crystal Clear lenses are a great replacement for Oakley OO9009 Flak Jacket XLJ sunglasses. These interchangeable lenses are high quality and made specifically for the Oakley OO9009 model. The crystal clear clarity and flawless fit of these lenses is truly impressive. They are also impact resistant so you don't have to worry about them breaking or tearing easily. Additionally, these lenses provide full protection from harmful UV rays and are polarized, meaning they reduce glare and improve the color and clarity of vision. As someone who has tried these lenses, I can attest that they have all of the above. In summary, if you are looking for durable, crystal clear lenses that offer excellent protection and visibility for your Oakley Flak Jacket XLJ sunglasses, Predrox Crystal Clear replacement lenses are a great choice. Highly recommended!