The magic of whiskey lies in the art of maturation. New make spirit directly from the still is harsh and transparent, but over years in oak casks, it gains the deep amber color and complex aromas we love. Industry experts agree that over 70% of a whiskey's final flavor profile is determined by the cask. In this article, we delve into the secrets of major cask types and explain how cask sizes scientifically direct maturation rates and flavors.