The best stuff by far is the Velcro branded Velcro. But got to give the glue 24hrs once on so it can bond, after that it is pretty much never coming off.
What is the stuff actually called? As Velcro is a brand name which has become the general name regardless of brand.
... hook & fuzz?
http://en.wikipedia.org/wiki/Velcro#Applications
I was close, hook & loop