The foundation is about eight inches high and it is made of durable polymer in an interlocking system with Lateral beams for even support that allows it to be moved and assembled easily. Although it is for a sleep number bed, I have used it for regular mattresses too. Excellent support plus you don't need a metal frame. Can be used without a box spring but if used with a box spring it provides added height to your bed. Asking $100 obo