From The Official Website

The Macallan Double Cask 15 Years Old is a balanced single malt whisky created by bringing the perfect harmony of two oaks into one exceptional single malt whisky. Sherry seasoned American oak adds delicate vanilla to the subtle spice of European oak, delivering a whisky with a sweeter, warmer taste and character.

Two distinct oaks create the perfect harmony within one exceptional single malt whisky. Our Double Cask whiskies are aged in two types of oak, in specially selected hand-crafted casks seasoned with dry Oloroso sherry. American oak imparts delicate flavours of vanilla, citrus and butterscotch. European oak delivers the unmistakable subtle spice of The Macallan. Once matured after 15 years, these two exceptional whiskies unite to create a distinctive single malt with a sweeter, warmer taste and character.