The Oakley Flak Jacket XLJ Heritage Collection Sunglasses allow you to focus on the activity or course that lies before you, especially when you're teeing off or bombing hills on your bike. These lightweight sunglasses feature a durable O Matter frame with built-in Unobtanium sleeves that secure these shades on your head, even when your sweat starts to pour. In addition, two different sized nose pads allow you to customize the fit of these sunglasses. The sunglasses' Plutonite lens filters out 100% of harmful UV radiation. This lens also blocks high-energy blue light, and it's treated with an Iridium coating to balance light transmission, resulting in precise, crystal-clear vision.