It's a lot about the base. The 1-2 combination of a supportive mattress and well-built foundation is just what you need for restful sleep. With solid wood construction, a diagonal bar and corner supports, there's extra support and durability built into this foundation set. Smooth nonskid surface holds every style of mattress in place, including hybrid, memory foam and innerspring mattresses. Includes two foundations (required for a king mattress).