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The ER600 features the Progressive Rate Spring (US Patent 4,905,331), which provides additional edge support to the mattress and back support for the sleeper. The Progressive Rate Spring creates individualized support based on each sleeper's weight, adjusting to support each part of the body independent of any other sleeper. It additionally provides key support in the lumbar area.
||Progressive Rate Spring (US Patent 4,905,331) provides individualized support and additional back (lumbar) support
Tethered Wave Control System
||Four layers of 1.5 oz. fiber
One layer of 1/4" closed cell foam
Progressive Rate Spring Edge and Back Support
||Decorative S Class molded mattress top
Black Bottom; "L" Corner Construction
Fill and Air Vent Valves
Made in U.S.A
||Premium 24 mil Endura III Vinyl, Purple.
(Vinyl colors may vary and do not change the wave control system.)
||5 year limited, lifetime limited prorated warranty
Sterling Waterbed Warranty