I just bought a brand spanking new pair of Fast Jackets yesterday, polarized, non-XL. I've had a pair of Flak Jackets (USC edition) that I just absolutely love. They fit PERFECTLY. I use them for running, and whether it's 10 miles on my face or on top of my head, they never move an inch and I forget they are there. I'm gradually turning into an Oakley fanatic. I've spent hours and hours on their website over the last two weeks, lol. These new Fast Jackets, however, are heavier, and they fit sloppily. They are loose on my face. Is there a way to adjust the fit? Can an optometrist heat up the frames and tighten the curvature inward? I'm actually disappointed in them. Any suggestions? Returning them is NOT an option, unfortunately.