A soft mattress might feel cozy at first, but over time, it can cause discomfort and poor sleep quality. If you find yourself sinking too much or waking up with back pain, it may be time to rethink how firm your mattress should be. The right level of firmness can make a big difference in how well you sleep. For instance, a firm mattress is good for providing proper spinal alignment and reducing pressure points, especially for back and stomach sleepers.

But who needs a firm mattress the most? People with back pain, heavier individuals, and those who sleep on their back often benefit the most from a firmer surface.

Fortunately, there are simple ways to make your mattress firmer without buying a new one. From adding a firm mattress topper to adjusting your bed frame, these solutions can help you sleep better and wake up feeling more refreshed.

Key Takeaways

  • Discover practical and budget-friendly ways to firm up your mattress, extending its lifespan without buying a new one.
  • Explore effective methods like using mattress toppers, plywood supports, or rotating your mattress for improved comfort and support.
  • Learn why mattress firmness impacts sleep quality, spinal alignment, and overall well-being, helping you choose the right adjustments.
  • Find out how temperature, humidity, and bed frame stability influence mattress firmness, offering simple tweaks for a better night’s sleep.
  • Understand when it’s time to replace your mattress, recognizing signs of wear and tear that no fix can solve.
how to make mattress firmer
AUTHOR

Mattress Advisory

CATEGORY

Mattress Education

POSTED ON

March 28, 2025

Add a Mattress Topper

If your mattress feels too soft, adding a mattress topper is one of the easiest ways to make it firmer. Toppers come in various materials like latex, memory foam, and high-density polyfoam, all designed to provide extra support and firmness. A latex topper is especially effective because it offers a responsive yet supportive feel, helping to keep your spine aligned.

High-density memory foam toppers can also firm up a soft mattress while gently contouring to your body for added comfort. However, if you’re experiencing back pain, it’s worth considering the reasons why a firm mattress is hurting your back. Sometimes, too much firmness can create pressure points or misalignment, leading to discomfort.

To strike the right balance, choose a topper that’s at least 2 inches thick with a firm feel — it can make a noticeable difference in improving your sleep quality and overall comfort.

Use a Plywood Board Under the Mattress

If your mattress feels like it’s sagging or lacking support, placing a piece of plywood between the mattress and the bed frame or box spring can create a more stable, even surface. This is especially useful when firming up a memory foam mattress, as it helps prevent sinking and improves overall support. Be sure to cut the plywood to match the size of your mattress for a snug fit — this will keep it from shifting around.

Plywood works well because it minimizes sagging and provides a firm foundation without making the bed feel too stiff. However, it’s important to understand how to tell if a mattress is too soft or firm. If you wake up with back pain or feel like you’re sinking too much, it may be too soft; if you experience pressure points or discomfort, it might be too firm. A plywood board is an affordable and simple fix to find the right balance.

Adjust the Room Temperature

Do you know that temperature can affect mattress firmness?

  • Memory foam mattresses tend to soften when exposed to heat and firm up when it’s cooler.
  • Lowering the room temperature to around 60–68°F (15–20°C) can help keep the foam firm and supportive.

This is an easy fix that requires no effort or additional cost, but it can make a big difference in how your mattress feels.

Replace or Reinforce the Bed Frame

A weak or sagging bed frame can cause your mattress to feel softer than it actually is.

  • Consider replacing old slats or switching to a platform bed with a solid base.
  • If you have a box spring, ensure that it’s providing adequate support and not sagging.

A sturdy and supportive foundation helps maintain mattress firmness and prevents uneven sinking.

Let the Mattress Air Out

Moisture buildup can cause your mattress to soften over time, especially if you live in a humid environment. A simple solution is to let your mattress air out regularly. Remove it from the bed frame and place it in a well-ventilated area for a few hours to release any trapped moisture and restore some firmness. This method works particularly well for foam and hybrid mattresses, which are more likely to retain heat and moisture.

Understanding the difference between a firm mattress and a plush mattress can also help you figure out what level of support you need. A firm mattress provides more support and helps with spinal alignment, while a plush mattress offers a softer, more cushioned feel. If your mattress feels too soft, airing it out can help bring back some of its original firmness, making it more comfortable and supportive for a better night’s sleep.

how to make mattress firmer

Use a Mattress Protector

A mattress protector is a great way to add an extra layer of support and protection to your bed. It can make a noticeable difference in how firm your mattress feels while also shielding it from moisture, dust, and allergens. Look for a tightly fitted, quilted protector made from high-quality materials like cotton or polyester for the best results.

A good protector not only adds firmness but also helps maintain the mattress’s shape over time. If you find your mattress too firm, you might also want to explore simple ways to make a firm mattress softer. Adding a plush mattress topper or using softer bedding can help balance out the firmness without sacrificing support. A mattress protector is a simple yet effective way to enhance both comfort and longevity, giving you a better night’s sleep while keeping your mattress in top condition for years to come.

Try a Firm Mattress Pad

A firm mattress pad can work similarly to a mattress topper but provides a thinner layer of extra support.

  • Pads made from cotton, wool, or synthetic fibers can create a firmer surface.
  • They are easy to remove and clean, making them a convenient option for improving mattress feel.

Using a firm pad is a cost-effective and quick solution to increase mattress firmness without altering the mattress itself.

Check Mattress Quality and Age

Sometimes a mattress feels too soft because it’s simply old or made from low-quality materials. If your mattress is more than 7 to 10 years old, it might be time to consider replacing it. Over time, even the best mattresses lose their support, which can lead to poor sleep and discomfort.

High-quality materials like latex, high-density foam, or pocketed coils are designed to maintain firmness longer and provide better overall support. If you’re thinking about upgrading, it’s important to know where to buy a firm mattress that suits your needs.

Many reputable mattress brands offer trial periods, so you can test the firmness and comfort before making a final decision. Investing in a high-quality mattress can make a big difference in your sleep quality and overall comfort, saving you from recurring aches and restless nights. A well-made mattress will give you the support you need for years to come.

how to make mattress firmer

Use a Mattress Firming Spray or Solution

Mattress firming sprays or solutions are designed to tighten the fibers and materials in a mattress, making it feel firmer.

  • Look for non-toxic sprays designed for mattress use.
  • Apply the spray evenly across the mattress surface and let it dry completely before use.

While not as effective as other methods, a firming spray can provide a temporary boost in mattress support and firmness.

Final Thoughts

Making your mattress firmer doesn’t have to be complicated or expensive. Simple fixes like adding a topper or reinforcing the bed frame can go a long way in improving support and comfort. Finding the right balance between comfort and firmness is key to better sleep.

Sometimes, even small adjustments — like changing the room temperature or using a mattress pad — can make a noticeable difference in how your bed feels. If you’ve tried these tips and still wake up feeling uncomfortable, it might be time to invest in a new, high-quality mattress that suits your firmness needs. A mattress that properly supports your body can improve sleep quality and reduce aches and pains.

Don’t be afraid to experiment with different solutions until you find what works best for you. Better sleep starts with the right foundation — and with a little effort, you can create the perfect sleep environment.

Frequently Asked Questions

To make a soft bedding set firmer, consider adding a mattress topper with higher density foam or a firm material.

Yes, you can increase the firmness of a mattress using several methods. Whether your mattress feels too soft due to age, material breakdown, or personal preference.

If your mattress isn’t firm enough, there are a few easy fixes. Adding a firm mattress topper made of latex or high-density foam can help. A 2-inch topper works best for extra support. Placing a plywood board under the mattress reduces sagging and adds stability. Adjusting the bed frame by adding more slats or switching to a solid base can also make a difference.

Using a mattress topper.

Yes. Using plywood under your mattress is a viable option, particularly if you have an older bed base or a slatted frame with wide gaps.

Whether a firmer or softer mattress is better depends on your sleeping position, body type, and personal comfort preferences.

Yes, a mattress pad can make a bed firmer, but it depends on the type of pad you use.

A firm mattress can be better for your back — but it depends on your sleep position and body type.

For back and stomach sleepers, a firm mattress helps keep the spine properly aligned, which reduces strain on the back. It prevents your hips and lower back from sinking too much, which can lead to misalignment and discomfort.

To firm up a sagging mattress, try rotating it 180 degrees or flipping it if it’s double-sided. Placing a plywood board between the mattress and the bed frame can create a more stable surface and reduce sagging. 

Yes, a firm mattress can cause back pain if it’s too firm for your body type or sleep position. A mattress that’s too firm can create pressure points on the hips, shoulders, and lower back, preventing the spine from aligning properly.

Published On: March 28th, 2025|Last Updated: March 28th, 2025|Categories: Mattress Education|9.2 min read|Views: 50|

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