A 15 year old single malt Scotch from Glenfiddich Distillery, made up of whiskies matured in American bourbon, sherry, and virgin oak. Inspired by the classic sherry-making bodegas of Spain and Portugal, the 15-year-old whiskies are left to mellow and intensify in a solera vat, a large oak vat that hasn't been emptied since 1998.