Description of Oakley Flak Jacket Sunglasses - Brown Smoke/VR50 Transitions Sport professionals demand nothing less than the best, and Oakley has answered their challenge for decades. World-class athletes have driven us to create innovation after innovation, including interchangeable lens designs with unbeatable optical clarity. FLAK JACKET™ takes that to the next level with the latest in performance technology. Convenience gets a performance boost with OAKLEY ACTIVATED BY TRANSITIONS® lenses. As sunlight brightens, the lenses darken to keep up. When sunlight is scarce, the lens color gets much lighter but never goes away — so you get enhanced depth perception in shaded areas and cloudy places. This unique edition of FLAK JACKET™ comes with all the cutting-edge features that athletes demand. MAINTAINS SHARP, CLEAR VISION FLAK JACKET™ features Oakley Hydrophobic, a permanent lens coating that prevents rain and sweat from building up on the lens. It also repels skin oils and other contaminates, so the lens is smudge resistant and easy to keep clean. It even eliminates static electricity, so dirt and dust particles won’t cling. STAYS AHEAD OF THE SUN FLAK JACKET™ lets you change lenses in seconds to optimize vision in any sport environment. Multiple lens colors are available, and all lenses feature the unbeatable clarity of Oakley’s HIGH DEFINITION OPTICS® (HDO®). OFFERS A SECURE, CUSTOM FIT Choose the nose pads that give you the best fit — two sizes are included with every frame. Like the stem sleeves, they’re made of UNOBTAINIUM® to increase grip with perspiration. Oakley’s Three-Point Fit optimizes comfort and holds the lenses in precise optical alignment for superior clarity. OPTIMIZES COMFORT, PROTECTION AND CLARITY FLAK JACKET™ is made of lightweight O MATTER® for all-day comfort. Pure PLUTONITE® lens material filters out 100% of all UV, and FLAK JACKET™ meets ANSI Z87.1 standards for impact protection. The semi-rimless design means there’s no frame rim to block downward view. Optical clarity exceeds all ANSI Z87.1 standards, and XYZ OPTICS® extends razor-sharp vision all the way to the lens periphery. Features: Black Persimmon Iridium (Transition) Lens: Sport performance lens for flat to bright light. Filters blue light to boost contrast and increase depth perception in a wide variety of light conditions. Excellent for mountain biking and golf, and any other sport that takes you in and out of shaded areas. Light Transmission: 42% to 10% Protection Index: 2 Conditions: flat to bright light Neutral / Contrast: Contrast