Shoe or boot-shaped drinking vessels go back a long way; early proof of this can be seen in the Urnenfeld period at Korneuburg in Lower Austria (Austria), or from the gravesites of the Celtic chieftains of Hessen (Germany). The glass shape is based on real boots that were worn in the military until the 19th century, used for drinking either as a punishment (Mensurstiefel = literally 'duelling boot') or as a test of courage. From there, the custom spread through student fraternities. Due to its complex shape, a Bierstiefel cannot be manufactured by just any glass manufacturer; Oberglas, however, possesses the relevant experience and technology. The Bierstiefel comes in four sizes from the 4 cl spirits glass to the 1 l tankard.