Parabolas of past has been aged solely in Bourbon Barrels. Parabola 2021 has a subtle twist being that same base beer was matured in equal thirds bourbon, rye whiskey and wheated whiskey , then blended together. Brewers associate rye as bringing really great black pepper notes to beer, along with a rye bread character. The wheated bourbon barrels add a sweeter mouthfeel, and a cereal grain character which comes through as well. It just adds a layer of depth and complexity even deeper than Parabola already had.