From The Official Website

Dewar’s Double Double 21 Mizunara Oak Cask Finish brings the traditions of Scotland and Japan together to create a truly sophisticated experience that spans both worlds. Made with our unique 4-stage ageing process, this distinctive whisky is finished in Japanese Mizunara oak casks for extra smoothness and character.

Unlike American oak trees, Japanese Mizunara oak doesn’t grow straight and can take up to 200 years to mature. Consequently, whisky casks made from this wood are far from common. That makes Dewar’s Double Double 21 Mizunara Oak Cask Finish an even rarer treasure well worth seeking out. Every sip offers an intriguing balance of succulence, purity, and smoothness, with subtle notes of coconut and creamy vanilla with a sweet, clean finish.

Innovation comes in many forms, and in 2019 our Master Blender, Stephanie Macleod, released a new range of Blended Scotch Whiskies with a Four Stage Ageing Process for Ultimate Smoothness. This may sound like an indulgence but the series has been picking up gold medal awards the world over since being released.

We believe that in order to do things right and get the best results you should put in double the effort; everything else is just a job half done. So we asked ourselves how we could put in double the effort to our range that was already Double Aged for Extra Smoothness;and it was obvious..double it!

Our Double Double series has been aged, blended together, aged again, then finished in a curated selection of different specialty casks for ultimate smoothness.