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

Featured Mattress Firmness: Shoreline Firm Waterbed Insert

Firmness Rating: 7

This waterbed insert is our budget-friendly, two-sided premium mattress. It combines firm support with a layer of cushioning for a balanced feel, neither too hard nor too soft. Ideal for those seeking quality on a tight budget, this mattress offers comfort and support within the mid-firmness range. Note: Best suited for individuals under 200 lbs. Not an ideal option for those moving from a traditional waterbed to a regular mattress. Most suitable for individuals who have previously used a waterbed insert.


Understanding Mattress Firmness: A Quick Guide Of Our Firmness Rating Overview (1-10 Scale):


Firmness For Water Mattresses:

1: Ultra-Soft, our softest option. Imagine lying on a gently bobbing boat; this is our softest, cloud-like water mattress.
4: Firm, the firmest among water mattresses. This is where water meets firmness – still with that gentle water feel, but with maximum support.


Firmness For Coil Spring Mattresses:

5: Firm, marking the entry point into our coil spring range. It’s firmer than our firmest water mattress but maintains a gentle feel, providing a nice balance for those transitioning from water to coil spring mattresses.
10: Ultra Firm, the hardest mattress we offer. The epitome of firmness; think of lying on a firm, supportive surface that holds you perfectly without any sink.


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.

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

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