From the brewery:

As befits a Giesinger beer, we have our festival beer after the Munich Purity Law. Logical! With Munich water, barley malt, Hops and Munich air. And yet in this very special brew there is also a good portion of good mood, joy and celebration. The way it is in order to finally celebrate the festivals as they fall again. So: On a peaceful and joyful time. Cheers!