The Oakley Fast Jacket Sunglasses are performance eyewear that feature a unique interchangeable lens design that lets you match them to your environment. With Switchlock technology, the glasses’ lenses are held in place securely without putting any stress on them that might alter the optics. The Fast Jackets allow one to experience premium clarity as well as true, accurate vision. They have the right combination of light filtering, glare blocking, visual contrast and color balance to help you perform at your best, no matter the sport you are playing or where you are playing. Because Oakley is a world leader in performance innovation, the Fast Jacket comes with unbeatable technologies one expects.