Superb space saver, Converts into 2 beds, Safer than bunks. The folding legs allow you to fold the trundle down and push it under. When you do not need to use the trundle, the bed is only a king single size. The ensemble price includes the top mattress, the U shape bridge, and the bottom trundle. That is the complete set. 10 years warranty. We can do this in Single, King Single, and Long Single.