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How to Shorten a Mattress: Tailoring Your Bed to Fit Your Space

How to Shorten a Mattress: Tailoring Your Bed to Fit Your Space

How to Shorten a Mattress: Tailoring Your Bed to Fit Your Space

Finding a mattress that perfectly fits your space can sometimes be a challenge. In situations where a standard-sized mattress is too long, knowing how to shorten it can be incredibly useful. This article will cover everything from the feasibility of shortening different types of mattresses to step-by-step guides for memory foam and air mattresses.

Can You Shorten a Mattress?

Understanding the Feasibility and Considerations

How to Shorten My Memory Foam Mattress

Detailed Steps for Customizing Your Memory Foam Mattress

Altering a memory foam mattress to fit your space can be done with care and the right tools. Here’s how:

  1. Prepare Your Workspace: Lay the mattress on a flat, clean surface with ample space for you to work around.

  2. Marking the Mattress: Measure the desired length and use a straight edge to draw a clear, straight line where you will cut.

  3. Choosing the Right Tools: A sharp electric carving knife or a heavy-duty utility knife is ideal for cutting through memory foam.

  4. Cutting Process: Cut slowly and steadily along the marked line. Keep the knife perpendicular to the mattress for an even cut.

  5. Smoothing the Edges: After cutting, you may need to trim any uneven edges to ensure the mattress has a clean, smooth finish.

  6. Re-covering the Mattress: If the mattress cover was removed, you may need to alter or replace it to fit the new size of the mattress. Sewing or using a fabric adhesive can be effective for reattaching the cover.

  7. Testing for Comfort: Once resized, test the mattress to ensure it still provides the desired comfort and support.

When considering adjustments to your mattress, you might want to explore options like Puffy mattresses that offer a variety of sizes to fit diverse space requirements.

How to Shorten a Memory Foam Mattress for an RV

Customizing a Memory Foam Mattress for Your RV Space

RVs often require mattresses of non-standard sizes. Here’s how to customize a memory foam mattress for your RV:

  1. Exact Measurements: Measure the space in your RV where the mattress will be placed. Remember to account for any curves or corners specific to RV beds.

  2. Marking for RV-Specific Shapes: If the mattress needs to be shaped beyond simple shortening, create a template out of cardboard to help guide your cuts.

  3. Careful Cutting: Use an electric carving knife for precision. Cut slowly, following the template or marked lines.

  4. Trimming for Fit: After the initial cuts, you may need to trim the mattress further for a perfect fit. Test the mattress in the RV space and mark any additional adjustments needed.

  5. Finishing Touches: Once the mattress fits the space, re-cover or use a fitted sheet designed for the new dimensions.

  6. Comfort Check: Spend some time on the mattress to ensure it meets your comfort needs, particularly if it’s been significantly altered.

Customizing a memory foam mattress for an RV requires precision but can greatly enhance the comfort of your travels. Proper measurement and careful cutting are key to ensuring a successful modification.

Interested in how Puffy stacks up against other brands? Check out our mattress comparisons: Puffy vs Purple, Puffy vs Nectar, Puffy vs Casper, Puffy vs Leesa, Puffy vs Saatva, Puffy vs DreamCloud, and Puffy vs Tuft and Needle.

How to Shorten an Air Mattress

Tailoring Your Air Mattress for a Custom Fit

Shortening an air mattress requires a delicate touch and precision, as maintaining the integrity of the air chambers is crucial. Here’s how to go about it:

  1. Deflate the Mattress Completely: Ensure the mattress is fully deflated before starting. This reduces the risk of accidental cuts or punctures.

  2. Measure and Mark: Determine the new desired length of the mattress and mark the cutting area clearly. Use a straight edge to ensure the line is even and precise.

  1. Prepare for Cutting: Place the mattress on a flat, stable surface to ensure a clean, straight cut.

  2. Use the Right Tools: A sharp pair of scissors or a utility knife is essential for a clean cut. Be cautious to cut only the outer layer and not the internal air chambers.

  3. Cutting Process: Carefully cut along the marked line. If the mattress has internal baffles or structures, avoid cutting them as they are essential for the mattress’s stability.

  4. Resealing the Edge:

    • After cutting, you’ll need to reseal the edge to make it airtight. Use a heat sealer or a strong adhesive suitable for the mattress material.
    • If using adhesive, apply it evenly along the cut edge and press firmly to ensure a good seal.
  5. Testing for Leaks: Once the adhesive or sealant has dried, inflate the mattress and check for any air leaks. Apply additional adhesive or sealant if necessary.

  6. Final Touches: For a professional finish, you can add a binding or tape over the sealed edge.

Check out Puffy mattress reviews from real customers and see how we compare with other brands.

Tips for Maintaining Mattress Integrity After Shortening

Ensuring Longevity and Comfort of Your Customized Mattress

  1. Regular Checks: Periodically inspect the altered areas for signs of wear or damage.
  2. Proper Support: Ensure your shortened mattress is supported adequately to prevent sagging or uneven wear.
  3. Use Protective Covers: A good quality mattress protector can help safeguard the newly sized mattress from spills and damage.

For those not comfortable with DIY mattress alterations, choosing a Puffy Lux Mattress that comes in various sizes can be a convenient alternative, ensuring a perfect fit without the need for modifications.

Use our store locator to find the closest furniture or mattress store near you and feel the cloudlike comfort of our Puffy Mattress in person.


Shortening a mattress requires careful consideration and precision, but it can be an effective way to customize your sleeping space. Whether you’re adapting a memory foam mattress for an RV or resizing an air mattress, these steps can guide you through the process.

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