The Allianz Arena is a football stadium in Munich, Bavaria, Germany with a 75,000 seating capacity. Widely known for its exterior of inflated ETFE plastic panels, it is the first stadium in the world with a full colour changing exterior. Located at 25 Werner-Heisenberg-Allee at the northern edge of Munich's Schwabing-Freimann borough on the Fröttmaning Heath, it is the second-largest arena in Germany behind Signal Iduna Park in Dortmund.