Michter's Sour Mash is one of the distillery’s most popular whiskey's. It wasn't until 2012 that Michter’s US*1 Original Sour Mash was reintroduced back to the market. Sour Mash has quickly become a favorite of whiskey enthusiasts. Unable to be labeled as bourbon or rye, it is produced with a grain selection of nearly 50% corn with the remainder being rye.