Fans of New Belgium Brewing Co.’s famous sour brown ale may be getting a version aged in very special barrels.

La Folie Grand Reserve PX is an 8 percent ABV Flanders-style sour brown ale aged in barrels that previously held Pedro Ximenez sherry and conditioned on Tahitian vanilla beans. This would be the second release in the Fort Collins, Colo.-based brewery’s Grand Reserve Series, after La Folie Grand Reserve Geisha was released last year packaged in 750ml bottles.

As the names indicate, both beers incorporate New Belgium’s La Folie as its base, a 7 percent ABV Flanders-style sour brown ale aged in 13 wood foeders between one and three years that debuted in 1997.

According to labels filed with the Alcohol and Tobacco Tax and Trade Bureau (TTB), La Folie Grand Reserve PX will be packaged in 375ml bottles and carbonated with nitrogen instead of the more commonly used carbon dioxide.

An email sent the brewery for additional information was not immediately returned.