Oakley designed the Polarized Flak 2. 0 XL Sunglasses with an interchangeable lens system for versatile athletes from trail runners to cyclists. Their included Plutonite lenses features Oakley's HD Polarized technology that filters out 99% of reflective glare, and an Iridium premium lens coating balances light transmission. Plutonite lenses filter out 100% UVA, UVB, UVC, and harmful blue light up to 400nm. High Definition Optics ensure the Flak 2. 0s meet the American National Standards Institute's ratings for optical clarity, visual fidelity, and impact resistance. Like the lenses, the Flak 2. 0's O Matter frame feels comfortably light and durably stress resistant, and Unobtainium pads cover the nose and temples for slip resistant comfort.