Oakley Airbrake MTB Replacement Lens - One Size Fits Most - Prizm MTB Low LightGenuine Oakley Airbrake MTB Replacement Lenses. All Oakley lenses offer HDO Technology. One of the most advanced lens technologies in the game. They offer exceptional clarity across the entire field of view. Minimal refraction means you will get a true visual image of the trails ahead so your brain doesn't need have to work overtime. All with exception UV protection that black 100% of UVA, UVB & UVC rays and harmful blue light up to 400 nm.