Shoreline Waterbed Insert



Thin, Firm, 2-Sided, And Cheap!

Making a regular coil spring mattress fit a waterbed frame is super easy with Therapedic Shoreline Waterbed Insert.

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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. How will it fit?  Super single, California Queen, and California King Size wood framed waterbeds. Learn more about the specifics of this bed below.


It’s the ordinary, extraordinary, plain old mattress made to fit right inside your old waterbed frame. The Shoreline Waterbed Insert is Therapedic’s solution to your old waterbed woes.


Learn more in our details section below.
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Shoreline Waterbed Insert Mattress By Therapedic


Our Shoreline Waterbed Insert 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 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 water mattress and replace it with a regular one for a fraction of the cost of purchasing a new bed, mattress set, bedding, etc.


Did We Mention The Benefits

  • Two Sided
  • Flip it over
  • Spin it around – end to end
  • Double-sided
  • Turn it over

Firmness Rating: 1 Through 10 – 1 Is Our Softest Feel, And 10 Is The Hardest Feel

  • 1 = Our softest water mattress.
  • 4 = Our firmest water mattress.
  • 5 = Is our softest coil spring mattress NOTE (Our softest coil spring mattress is firmer than our firmest water mattress).
  • 10 = Is our firmest coil spring mattress.
  • Shoreline Waterbed Insert. Firmness Rating 6.5 – 7.0 Firm support with a fairly cushiony top.  This is not a rock-hard mattress, nor is it mushy and soft. Right in the middle for firmness. A very popular mattress on a budget. 

Take A Look At Some Of Our Other Waterbed Inserts/Mattress Replacements


The Traditional Coil Spring Mattress Built To Drop Into Your Existing Waterbed

  1. Custom mattress built to fit your waterbed.
  2. Drops right into your existing wood frame water bed.
  3. Keep your under-bed storage drawer pedestal.
  4. You will love making your bed again.
  5. Keep your matching bedroom furniture.
  6. Utilize your existing bedding. 
  7. No more filling, draining, filling or waterbed treatment is required.
3.6/5 (5 Reviews)

Additional information

Dimensions N/A

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Product Features

Shoreline Waterbed Mattress Insert Measurements / Sizes


Mattress Height

  • Complete Crown to Crown (Very top to the 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
  • Water Bed Mattress Replacement Insert Measures 46 wide x 82 long

California Queen Waterbed Frame

  • Cavity Measures 60 wide X 84 long
  • Water Bed Mattress Replacement Insert Measures 58 wide x 82 long

California King Waterbed Frame

  • Cavity Measures 72 wide X 84 long
  • Water Bed Mattress Replacement Insert Measures 70 wide x 82 long

Some More Details

  • Fabric – Damask
  • Quilt– SafeGuard®
    • 1″ Polyurethane Foam
  • Pillow Top – n/a
  • Upholstery
    • 1″ Polyurethane Foam
  • Insulator Pad
  • Support System
    • 460 Alternating VertiCoil Edge
    • 13 Gauge Steel Thickness
    • Coil Count Based on Traditional Mattress Sizes 
  • Twin–252
  • Full—357
  • Queen–460
  • King–575
  • Edge – Heavy Duty Border Rod
  • Warranty – 5 Year


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

To view a bigger selection of Waterbed Inserts we have to offer Click Here

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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