The Glenfiddich – Reserve Cask has matured in Spanish sherry casks, giving the whisky its signature flavor as intended by Malt Master Brian Kinsman. Before bottling the casks are married in a Solera vat, which allows the whisky to meld together into a complex and unifying whole. The Glenfiddich – Reserve Cask is a rich single malt from one of the most celebrated Scottish whisky distilleries in the world.