Oakley Flak Beta SunglassesThe Oakley Flak Beta Sunglasses are a new addition to the Flak collection and comes loaded with new features that make it stand out from the flock. They feature an interchangeable lens design, which offers the benefits from performance eyewear, delivering unrivaled innovation to those who want to see the difference technology makes in a full range of activities. They come equipped with PRIZM, which is revolutionary lens technology that fine-tunes vision for specific sports and environments.FeaturesPRIZM(TM) is a revolutionary lens technology that fine-tunes vision for specific sports and environments.Swap out the lenses when light changes, and take full advantage of High Definition Optics(R) with ANSI Z87.1 standards of clarity and impact resistanceWide peripheral view stays sharp with XYZ Optics(R) while the contouring improves side protection against sun and windUnobtainium(R) nosepads increase grip with perspiration for a no slip gripThree-Point Fit holds lenses in precise optical alignment while eliminating pressure pointsPlutonite(R) Lenses offer top UV Protection filtering 100% of all UVA, UVB, UVC and harmful blue light up to 400nmO Matter(TM) stress-resistant frame material is both lightweight and durable for all-day comfort and protection | Oakley Flak Beta Sunglasses Men's in Matte Black/Grey Lens