Balvenie Doublewood is, to not much surprise, aged in two kinds of oak casks! It was firstly matured in refill American oak casks before it was treated to a finish in first fill European oak Oloroso sherry butts for an additional nine months. The expression was launched in 1993, and has become a somewhat iconic bottling over the years. Even at 12 years old, this rich and complex dram is an excellent example of what the Balvenie distillery can craft.