Oakley engineering takes performance to the next level and brings style along for the ride. Flak 2.0 offers a standard size frame with enhanced lens coverage, and every millimeter of the lens is optimized with High Definition Optics in a ruggedly durable yet lightweight design. Designed to push your limits with patented XYZ Optics for razor sharp clarity and secure grip of Unobtanium. All Oakley lenses offer HDO Technology with 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 a truer visual image so your brain won't have to work overtime. - UV Protection: All Oakley lenses block 100% of UVA, UVB & UVC rays and harmful blue light up to 400 nm. - Light Transmission: 11% - Light Conditions: Bright Light - Contrast: Neutral - Base Lens Color: Grey