Push yourself to the limit with the Oakley Flak 2. 0 XL Prizm Sunglasses. Sure to overtake the competition, these interchangeable shades have Prizm lenses to eliminate the intense glare on the road while enhancing contrast and visibility, making sure you see every rock and pothole that might sneak up on you. Extended periphery and extra protection from the wind, sun, and impact is found in these lenses' seemingly boundless 8. 75 base curvature. Built to take a spill, the impact absorbing O Matter frame is highly stress resistant and will keep you in the race, even after taking a low hanging branch to the face. Unobtainium grips on the nose and temples provide a sure, comfortable fit that increases its grip when it gets sweaty to make sure you have clear vision all the way through the finish line.