The Oakley Flak Jacket XLJ Replacement Lenses offer slightly wider coverage for larger face sizes. Swap your Flak Jacket Lenses out in moments to adjust for suit super bright or overcast days. Or just replace a pair of scratched lenses on your Flak Jackets. As with all Oakley lenses, this replacement pair of lenses contain Oakley's optics for the uncompromisingly clear vision you demand whether you're out on the trail or fighting rush hour traffic. * See sizing chart for different lens tints and uses.