Following distillation, a portion of The Arran 16YO Single Malt (70%) is matured in American oak casks that were previously used to mature bourbon, while the remainder (30%) is matured in Spanish oak casks that were previously used to mature sherry. The bourbon casks contribute notes of spicy cinnamon, oak and honey to the whisky, which is complemented by the notes of dark fruits (particularly cherries) and lush citrus added by the sherry casks. In addition, the Isle of Arran's unique microclimate the Isle enjoys a warm Gulf Stream and cool, breezy summers contributes a hint of salty tang to the whisky as it matures.