The Glenrothes is a single malt Scotch whisky, produced at the Glenrothes Distillery. The Glenrothes is mainly matured in Spanish ex-Sherry casks, and some ex-Bourbon casks. The Glenrothes is unique compared to other single malts in that, beginning in 1994, the bottlings are not determined by age but by vintage. More info at The Glenrothes.