We gave the Oakley Split Jacket interchangeable lenses with Switchlock technology that makes lens changing easy and fast. Accented with true metal icons, the lightweight frame is made of stress-resistant O Matter with Unobtainium stem sleeves and nose pads that actually increase grip when you sweat. Our Three-Point Fit optimizes comfort while keeping the lenses in precise optical alignment. Take a close look at how the lenses contour at the sides, maximizing protection against sun, wind and side impact. It’s a full 8.75 base lens curvature that utilizes patented XYZ Optics to offer razor sharp clarity at every angle of view. You’ll have extended peripheral vision and performance that meets ANSI Z87.1 standards, thanks to High Definition Optics (HDO). Oakley HDO also means protection, so Split Jacket meets ANSI Z87.1 standards for high velocity and high mass impact resistance.