Glendalough Double Barrel Irish Whiskey is a single grain Irish whiskey, initially matured in American bourbon barrels before enjoying a finishing period of six months in Spanish Oloroso Sherry casks. This comes bottled at 42% ABV, brought down to this strength by Wicklow mountain water. A rather tasty release presented by Glendalough, rich in vanilla, caramel, Christmas spices and dried fruit notes.