Dewar's Double Double 21 Year Old is a rare and special blended Scotch whisky. Created using a unique 4 stage aging process, this scotch liquor is finished in Oloroso sherry casks for subtle notes of cinnamon and ripe vine fruits, and a supremely silky smooth long finish. This unique 4-stage aging process was invented by Dewar's current Master Blender Stephanie Macleod. The scotch whisky is returned to barrel 4 separate times to allow the flavor to develop and mellow into Dewar's smoothest whisky yet.