Part of the Standard Issue series for combat-ready performance, Oakley SI Flak 2.0 XL OO9188 Polarized Sunglasses boast lightweight, durable, semi-rimless O Matter frames and enhanced lens coverage that makes them ideal for runners, athletes, and outdoor sports. These Oakley sunglasses feature HDPolarized lenses made from Plutonite (polycarbonate) that filter 99% of reflected glare without the haze or optical distortion of other lenses. Prizm lenses are designed to deliver ultra-precise color tuning for any environment.