BJCP 26B
A deep reddish-copper, moderately strong, malty, complex Trappist ale with rich malty flavors, dark or dried fruit esters, and light alcohol blended together in a malty presentation that still finishes fairly dry.
Most commercial examples are in the 6.5 - 7% ABV range. Traditionally bottle-conditioned (or refermented in the bottle).
Affligem Dubbel, Chimay Première, Corsendonk Pater, Grimbergen Double, La Trappe Dubbel, St. Bernardus Pater 6, Trappistes Rochefort 6, Westmalle Dubbel