Most “box springs” being sold today are actually foundation platforms. They are plywood boxes with a very thin layer of padding at the top.
The primary purpose of these foundations is to add height to the sleeping surface.
With a good quality mattress that is at least 10 inches thick, the added foundation makes only a slight difference in either the comfort or the lifespan of the mattress.
The combination of a steel bed frame (or siderails connecting a headboard and footboard), a foundation (or box spring) and a mattress, pus the sleeping surface at the height most people prefer.
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