I needed to replace the lenses in a spare pair of Oakley Monster Dogs, and didn't feel like paying the $85 that Oakley wants for their polarized lenses.  These lenses are about 85% the thickness of the original Oakley's but you would never notice it once they are installed in the frame.  Popping the old lenses out and getting these in was easier than I expected.  Great fit, look fantastic, I'd order from these guys again in the future.