Enjoy your favourite outdoor activities and keep your vision clear with these Oakley sunglasses. Flak 2.0 offers a standard size frame with enhanced lens coverage, and every millimetre of the lens is optimised with HighDefinitionOptics® in a ruggedly durable yet lightweight design. The pair features patented XYZ Optics® for razor sharp clarity and secure grip of Unobtanium®. The High Definition Optics® technology offers the following benefits: Clarity: Conventional lenses can magnify images. HDO® precision gives less distorted vision across the entire field of view. Refraction: With regular lenses, objects aren't really where you see them. HDO® offers an enhanced and more realistic visual image. UV Protection: All Oakley lenses block 100% of UVA, UVB & UVC rays and harmful blue light up to 400 nm.