Oakley Fast Jacket XL with Iridium and Jade SunglassesOakley took the idea of "adapt and conquer" to the extreme. Oakley Fast Jacket XL is a performance product with a unique interchangeable lens design that lets you match your optics to your environment. Switching out the lenses is fast and easy, thanks to Switchlock Technology. It's an innovation that locks the lenses in place with a quick release system. With Switchlock, the lenses are securely suspended without any stresses that could alter the optics, so you'll have premium clarity with true, accurate vision. They shaped stainless steel with metal injection molding to create a convenient button that releases each lens. That means minimal handling and no hassle. Just put in a new lens set and go.