From the brewery:

This is one of the oldest beers of Westmalle Abbey, with a tradition that dates back to the start of our brewery. It was created to drink with meals in the abbey, something the monks still do today. As a top fermented golden yellow Trappist beer, the Extra is unique in combining a low alcohol content (4.8%) with a rich flavour. Enjoy its fruity notes and its refreshing, thirst-quenching character.