Source: Distillery,

The Dalmore 15 year old is smooth, rich and well rounded; the epitome of The Dalmore house style.
This delicate and approachable vintage is initially matured for 12 years in American white oak ex-bourbon casks. The character of The Dalmore 15 is achieved by then splitting the whisky equally between three different sherry woods; Amoroso, Apostoles and Matusalem oloroso for a further three years. The spirit is finally married together in an upstanding sherry butt, allowing the flavours to infuse.