There is a design flaw which you can see in the product photos! The two center boards (part of the frames for the seperate back and seat) sits 12 inch above the slats. And you can certainly feel it (new 8” futon, in case you were wondering). I considered shaving that 12” off, or lowering the bolt holes but that would certainly make the boards weaker and more likely to break. I may see if I can put in some uber-slats to bring the rest of the bed up to that level, or, perhaps, a board. What were they thinking!