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6621 Waveless Softside Mattress 6 1/4" fill depth

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Sterling 6621 Waveless Waterbed Replacement Mattress

  • Replacement for 6.25" deep mattress systems or Santa Monica only
  • Semi waveless with lumbar support
  • 6.25" fill depth water mattresses
  • Premium 20 mil Endura III Vinyl, "Bali Blue"
  • 2 full size layers of 1.5 oz. Fiber
  • 2 Layers of Lumbar Support
  • Tethered Wave Control System
  • Made in U.S.A.
  • Vinyl colors may vary, does not change the wave control system
  • 4 year Full Warranty; 16 Year Prorated Warranty

Sterling Endura III™ Waterbed PVC

Sterling Endura III™ waterbed PVC was developed exclusively for Sterling Sleep Systems to meet all recognized performance and health standards established for waterbed vinyl in the US and in the European Community. We certify that Endura III contains less than 75ppm cadmium and meets all recognized limitations regarding heavy metal content.

In manufacturing, and particularly when manufacturing waterbeds, material quality governs product excellence. No matter how skilled the fabricator a waterbed can be no better than the material it is made from. Endura III is formulated with the finest resins and plasticizers available for the application. We engineered Endura III to be the best piece of material possible.

Endura III™ significantly exceeds the California Bureau of home furnishings performance standards. A key indicator of material excellence is low temperature performance “cold crack test” results. Over the last 20 years we learned that low temperature performance is an important indicator of overall material formulation stability, not just a measure of how well the product will survive shipping during winter months. The California Bureau of Home Furnishings standards required waterbed material to pass a –20 F test, we engineered Endura III to exceed –35 degree F. We are not aware of any other waterbed material that equals this standard currently.

We won’t share the specifics of the Endura III vinyl formulation, however we will tell you, you can’t buy better material for making a durable, long lasting, quality waterbed.


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Single or Dual Mattress

Customized Price: $209.00
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Formula 55 Waterbed Conditioner with Odor Prevention
Sterling 8 oz 1 Yr Water Conditioner
Designer stretch zipper cover washable
6.25" fill depth 8 mil fitted safety liner
Sterling Sleep Waterbed Safety Liner for 9 inch Hardside Waterbeds
8 mil stand up liner



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