After maturing the whisky for 21 years, their Malt Master adds even warmer and richer flavours by uniquely finishing this single malt in first fill bourbon barrels that once contained rum from the Caribbean. The rum-soaked cask infuses the aged whisky with a spicy warmth and indulgent vanilla and toffee sweetness, the character of the Caribbean shining through. This gives the whisky a sumptuous sweet intensity that is both rich and creamy yet still retains the unmistakable character of Glenfiddich.