Oakley Fast Jacket XL is the newest Oakley semi rimless model. The Fast Jacket XL has a slightly larger lens than the regular Fast Jacket. This new lock-in lens interchange system is ingenious! And even the Prescription Oakley Fast Jacket XL lenses can be snapped in and out. If the Oakley Flak Jacket lens was just a bit small for you, this Fast Jacket will be perfect.