From the distillery: "Glenfiddich Excellence is an exceptionally rare single malt Scotch whisky that has spent 26 years maturing in American Oak ex-Bourbon casks. American “Quercus alba” oak is renowned for its exceptional quality. The wood softens the spirit and imparts layers of subtle spice and sweet vanilla flavors that grow more complex over time. This exceptional single malt is a vibrant, yet soft and delicate expression, with a deep and complex balance of sweetness and dry oak tannin that’s bound to excite the palate and awaken the nose."