Engineered with sport performance in the forefront of their mind, Oakley's Flak Jacket XLJ sunglasses were made to go further, train harder, and excel no matter what the conditions. Constructed with lightweight and durable O Matter™ these frames can handle just about anything, while staying comfortable all-day. The Unbotanium earsocks and nosepads keep your shades in place, even if sweat, rain or snow tries to slip them up. Topping off this titan of functionality, the XLJ designation lets you know these large lenses are curved at the bottom to fit around your cheekbones, and they are completely interchangeable. This means you can go from a golf course, to a race track, even up a mountain, using lenses optimized for that specific location. Do more, go further, and don't forget your Flak Jacket XLJ. Features of Oakley Flak Jacket XLJ Sunglasses Lightweight and Durable O Matter™ Frame No-Slip Unobtainium™ Earsocks and Nosepads Three-Point Fit Designed for Comfort and to Keep Your Eyewear in Place 8.75 Base Lens Geometry with HDO™ Available with PRIZM™ Lenses Designed to Enhance Color, Contrast and Detail Polarized and Iridium™ Lens Options Available Oakley SI Flak Jacket XLJ Matte Black w/Grey Lenses 11-004