Shoreline Waterbed Insert


fs_prod1 (1)Thin, Firm, 2-Sided, and Cheap!

Making a regular coil spring mattress fit of a waterbed frame is a super easy with Therapedic “Shoreline” firm waterbed insert. Simply pull out your old water mattress and heater and keep your safety liner. Next replace it with this special mattress that is firm and supportive with traditional innerspring coils found in brand name mattresses instead of water. What makes our mattress different is that it has two sides so it can be  flipped over and turned for longer life. What will it fit?  Super single, California Queen, and California King Size wood framed waterbeds. Learn more about the specifics of this bed below.
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SKU: 1126i-Parent Category:


Shoreline Mattress By Therapedic

Our Shoreline replacement mattress is made with a lower profile design that won’t stick up too far above your sides and is slightly undercut for a better fit in your existing wood frame waterbed. This has a couple of important benefits like making the bed easier and being able to tuck in your sheets and bedding along the ends and sides when you dress your it up. One of the most important features is the double sided sleeping surface that will get you more life out of your mattress with regular rotation and flipping. So ditch your old watermattress and replace it with a regular one for a fraction of the cost of purchasing a new bed, mattress set, bedding etc.

Detailed Measurements / Sizes

Mattress Height:

Complete Crown to Crown (Very top to very bottom)   Approx. 9 1/2″

Tape Edge to Tape Edge on Side Border Panel 7 1/2

Super Single Waterbed Frame
Cavity Measures 48 wide X 84 long
Custom Made Waterbed Mattress Insert Shoreline Firm Measures 46 wide x 82 long

California Queen Waterbed Frame
Cavity Measures 60 wide X 84 long
Custom Made Waterbed Mattress Insert Shoreline Firm Measures 58 wide x 82 long

California King Waterbed Frame
Cavity Measures 72 wide X 84 long
Custom Made Waterbed Mattress Insert Shoreline Firm Measures 70 wide x 82 long




1″ Polyurethane Foam

Pillow Top—n/a


1″ Polyurethane Foam

Insulator Pad

Support System

460 Alternating VertiCoil Edge

13 Gauge Steel Thickness

Coil Count Based on Traditional Mattress Sizes 


Edge—Heavy Duty Boarder Rod

Warranty–5 Year

Photo for illustration purposes. Fabric color may vary from actual photo.

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0/5 (0 Reviews)

Additional information

Weight 85 lbs

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1 review for Shoreline Waterbed Insert

  1. Cynthia Burton (verified owner)

    I have had this mattress for a year and a half. I bought the waterbed insert Shoreline double sided mattress to replace a full motion waterbed. I was looking for a mattress that was affordable, comfortable, and with care, lasting. SLTBes spoke with me at length on the phone about the contrast with a waterbed and other things I should know about this mattress.. The first night I was so sad and missed my old bed, which I’d had for 30 years, purely sentiment. But I had bought a feather bed of excellent quality to go on top. I slept well the first night, though I didn’t like sitting on my bed as much at first. I continued to sleep well but the best thing is what’s happening over time. My back is recovering from strain much faster. I have bursitis in my hip and it has not bothered me. Two year ago, with less strain, I was on muscle relaxers for a week and taking ibuprofen at the maximum dose. I have had no need of this. I am SO happy with this purchase!!

  2. Douglas Belleville

    Cynthia, We are so happy that all is going well with your mattress insert. That is a great mattress and I really love the double sided flippable feature. While mattresses are not a cure all for ailments, they can often add comfort and give us some level of relief. I am happy that seems to be the case for you. Pleasant dreams. Doug

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