The only part of the bed that isn't 100% wood is the inner slats that seem to be some kind of pressed board which we plan on replacing at some point.  As is, the bed is great.  Initially, my bed in a box that we were using before on top of another box spring prior was HARD where it hadn't been before.  Its now been four days and I'm adjusting quite well and love the bed.  It looks great, was straight forward to put together and can't wait til I can get a headboard for it.  I could not have gotten a bed this solid for this price anywhere else (I paid $200).