The Oakley Split Jacket Transitions SOLFX Sunglasses have SWITCHLOCK(TM) technology which makes lens changing easy and fast. All lenses are optimized with Hydrophobic/Oleophobic technology that repels dust and helps maintain a smudge resistant barrier against skin oils, lotions and fingerprints while preventing water from leaving streaks and sheens. Accented with true metal icons, the lightweight frame is made of stress-resistant O MATTER(R) with UNOBTAINIUM(R) stem sleeves and nose pads that actually increase grip when you sweat. Oakley's 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(R) to offer razor sharp clarity at every angle of view. You'll have extended peripheral vision and performance that meets all ANSI Z87.1 standards, thanks to HIGH DEFINITION OPTICS(R) (HDO(R)). Oakley HDO(R) also means protection, so SPLIT JACKET meets all ANSI Z87.1 standards for high velocity and high mass impact resistance. The PLUTONITE(R) lens material filters out every eye-baking ray of UV, not just UVA and UVB, and the TRANSITIONS(R) SOLFX(TM) lenses adapt to changing light with photochromic technology. SPLIT JACKET comes with an Oakley Soft Vault case that stows the lens/frame combination and an extra pair of optional lenses. LENS: