Dewar's Double Double 20 Year Old is inspired by a process pioneered by Dewar's in 1901. Our Double Double Series has been aged, blended together, aged again, then finished in sherry casks for the Ultimate Smoothness. Dewar’s Double Double 20 Year Old is finished in Oloroso sherry casks, this blend delivers subtle notes of cinnamon and ripe vine fruits with a silky smooth finish.