They know how much kids want to wear their brand because they are such a big name in the ski biz and they will only let sponsored riders and reps wear it. They also have people who work for red bull buy everything off ebay that is a true rebull product.
here is an example:
http://cgi.ebay.com/Red-bull-New-Era-59FIFTY-hat-very-rare-size-7-3-8-NR_W0QQitemZ170101772208QQihZ007QQcategoryZ52366QQrdZ1QQcmdZViewItem