The mattress set is not only the mattress, it also includes the foundation. Without the proper support to the mattress, the mattress will not perform to its expectations. To get the most out of the mattress and a good night sleep, you must have a good foundation. For years, wood foundations have been used because there was no alternative. They come with natural defects like knots, holes, bark, and cracks that can cause breakage and noise. Wood is also prone to mildew, rot, and house bugs. Now with the innovation of steel foundations, a better, stronger support system has been created.
For more information, take a look at Leggett and Platt's research.