Other Features:

The 700 is Sterling's top-of-the line, wave-reduced waterbed mattress. This 9- inch hard-side wb mattress has four fiber layers for comfort and an extra 1/2-inch layer of closed-cell foam providing ultra firm support.

The Progressive Rate Springs which is exclusive to the Sterling waterbed mattresses, it aids in getting in and out of the waterbed. This extra feature on the sides helps prevent you from sinking down. Progressive Rate Springs are also used in the lumbar area to provide individualized support based on each sleeper's weight.