The versatile Oakley Half Jacket XLJ Sunglasses Activated by Transitions offer large lenses for people with large faces or who want extra coverage. These lenses lighten and darken automatically, depending on light conditions. Whether you ride your bike at dawn, trail run in partly cloudy conditions, or stroll through the park under the noonday sun, these sunglasses transition, so theyre neither too dark nor too light. The Half Jacket XLJ Sunglasses have an interchangeable lens system, so you can swap out lenses when you please. The lightweight, durable open-edge frame stays comfortable all day. Oakleys patented grippy arm and nose pads hold your glasses on your face as you bike, hike, or just enjoy the sun. Additional lenses are sold separately.