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As you mach down singletrack or run along shady trails, the Oakley Flak Jacket Transitions Sunglasses adapt to changing light conditions to give you unparalleled visual clarity. Activated by Transitions technology means the Flak Jacket Sunglasses' lenses lighten to show hazards on shaded paths, and darken to shield your eyes in the sunshine. This technology works with balanced light filtering and Oakley's High Definition Optics to bring you outstanding color contrast, clarity, and depth perception—even in low light conditions. O Matter frames make the Flak Jacket Sunglasses feel incredibly lightweight, increase durability, and create balanced pressure points for a comfortable fit. When you work up a sweat, Unobtainium nose pads and stem sleeves increase their grip so these Oakleys won't slip off your face.

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Great mountain biking glasses

    This are excellent glasses for mountain biking. The green vegetation looks fluorescent when you put the on. In the shade and in the sun the lenses keep you vision clear and without glare (as advertised). I have owned them for a few months now and I love them!

    excellent sunglasses

      These have got to be the best sunglasses I have ever bought. The VR50 lenses are unbelievable,they make everything pop out at you, the clarity and definition is unreal, if you are a trail runner or outdoor enthusiast these glasses are a must have.

      Im a motorbiker. Will this fit with my...

      Im a motorbiker. Will this fit with my helmet on?