The richly layered Glenfiddich 15 Year Old single malt Scotch whisky is innovatively matured in three types of oak cask: sherry, bourbon and new oak, before being married in a unique, handcrafted Oregon pine Solera vat. Year on year this Solera vat is never emptied but is always kept at least half full creating a deliciously harmonious and intense whisky which gets more complex and intriguing every year.