Oakley Fast Jacket™ 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. We 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.