Unusual for a Scottish distillery, Auchentoshan practices triple distillation. Generally the final stage of Scotch whisky production involves distilling the fermented mash in two copper stills. In Auchentoshan, a third still (known as the "Intermediate Still") helps to give a final spirit strength of 81% ABV (162 proof). This triple distillation, in addition to an unpeated malt, gives Auchentoshan a more delicate and sweet flavour than many Scotch whiskies. Maturation is mainly in ex-bourbon barrels and ex-sherry butts, though some Auchentoshans will mature in French wine casks.