The master of the dark side, the ultimate Sith himself is at it again---destroying everything in his path for pure vengeance! Show your dark side with this 20 ounce tumbler and let the master use his masterful use of the force to keep your beverage piping hot (just like Mustafar) for up to 12 hours or chillingly cold (just like Vader's heart) for up to 12 hours!