According to the Reinheitsgebot or German Purity Law, the only ingredients legally allowed in true beer are malted barley, hops, water and yeast. Of course, any good beer geek knows this already.
This shirt is modeled after the ubiquitous rock band t-shirts - "John & Paul & George & Ringo." or "Tommy & Nikki & Mick & Vince." or "Ace & Paul & Peter & Gene." or... well you get the idea.
This parody of the Rock Band style shirt features the four primary ingredients of beer in block lettering on a classic 100% cotton tee.