Oakley Unisex Flak Jacket sunglasses. Flak Jacket sunglasses feature Oakley HydrophobicC, a permanent lens coating that prevents rain and sweat from building up on the lens to maintain sharp, clear vision. The Flak Jacket frame has interchangeable lenses which you change 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. Flak Jacket is made of lightweight O Matter for all-day comfort. The pure plutonite lens material filters out 100% of all UV, and meets ANSI Z87.1 standards for impact protection. The semi-rimless design means there`s no frame rim to block downward view., Frame Colour: Polished Rootbeer, EU Filter 3P, Lens Gradient: No, Hinge Type: No Flex, Mirrored: No, Polarised: Yes, Round Sunglasses, Usage: Sport, Molded.