High Definition Optics (HDO) combines patented optics and Plutonite lens material that provides 100% UV filtering and unsurpassed impact protection. Oakley may call them “accessory lenses” but they make them for athletes who take full advantage of their adaptable eyewear. Engineered for Oakley's Half Jacket frame, these interchangeable lenses come in multiple color options. Choose a lens for the best optical performance under current light conditions, or switch to a different hue to change your look instantly. These lenses give you the razor-sharp clarity and unbeatable performance of Oakley's High Definition Optics (HDO). Two lens shapes are available, and you can even get them with Oakley technology that produces the best polarized lenses on the planet. For protection their Plutonite lens material filters out 100% of all UV, not just UVA and UVB. And when it comes to high-mass and high-velocity impact, the installed lenses meet all protection standards of the American National Standards Institute. So forget about lugging around extra pairs of shades for when light changes. With Half Jacket and accessory lens kits, you'll be ready for anything.