I believe this is what was used on mine:
SunTek Top Coat.
However, it does have to be stretched quite a bit on the front bumper and I have a small triangle that's come up from the bumper. Had the guy cut it once and it came up again, I'm afraid to keep trimming it, fearing it will need to be redone.
Also, it was penetrated by a sharp rock.
This is the first clear bra I have used, so I'm not sure if that's the norm. It's done pretty well otherwise. I can see marks where it's been hit hard too, but wasn't penetrated.