Glenfiddich 15 Years Old Unique Solera Reserve is a distinguished single malt Scotch whisky from the renowned Glenfiddich distillery in Dufftown, Scotland. This expression is meticulously matured for 15 years in a combination of European oak sherry casks, American oak bourbon casks, and new oak casks. The whisky is then mellowed in a unique Solera Vat—a large oak tun inspired by the sherry bodegas of Spain and Portugal—never emptied and kept half full of whiskies since 1998. This innovative process creates a harmonious whisky that gets richer and more complex every year.