Aberlour a'bunadh is a natural single cask strength malt whisky. Taken directly from specially selected sherry casks, it is bottled as simply as possible, without the use of modern filtering methods or the addition of water. Only the best Sherry Butts, which previously held oloroso, have been selected by Aberlour's Director. These casks are the rarest and the most precious used for whisky maturation. They date back to the old days when sherry was imported from Spain in casks which were then left empty sitting in UK ports or ships.