The Whistler Double Oaked is a hand-selected, premium Irish whiskey expression made in small batches using some of Ireland's finest malt and grain whiskies. The blend is 20% single malt (barley malt) whiskey and 80% grain (corn) whisky. The finest malt whiskey and grain whiskey are chosen by the Head Distiller to mature in ex-bourbon casks before being blended together in ex-sherry casks to complete this exquisite blend.