ThemeForest - X v3.2.5 - The Premium WordPress Theme | 54 MBPHP | CSS | JS Stacks - X includes multiple unique designs inside of one powerful theme. No setup required, works simply and easily. We refer to these designs as "Stacks." There are currently three Stacks available in X, with more on the way. It's like buying one theme and constantly getting access to new themes all the time!