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 thier 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.