Here's the back of the koozie for those of you that don't already know about them. They were designed by Billbob, they are taller that the normal koozie, which usually leaves over half an inch of exposed aluminum on aluminum cans. That extra aluminum acts as a heat sink, so the extra covering of this design helps keep your favorite beverage cold (and concealed). It's thicker than the normal koozie, 5mm instead of 3mm. And it has a handy cutout where you drink from.
Back side of The Billbob.