How To Make My Mattress Firmer?

If you find your mattress too soft and are looking for ways to make it firmer, there are several strategies you can employ to achieve the desired firmness and improve your sleep quality. From using plywood supports or mattress toppers to adjusting the room temperature, these methods can provide a firmer sleeping surface without the need to purchase a new mattress.

Understanding Mattress Firmness

Before diving into the solutions, it’s important to understand what influences mattress firmness. The perceived firmness of a mattress can be affected by its internal structure, the materials used, the weight of the sleeper, and even the ambient temperature. Over time, mattresses may lose their initial firmness due to wear and tear.

Why Does Mattress Firmness Matter?

Having the right mattress firmness is crucial for a restful night’s sleep. It supports proper alignment of the spine, relieves pressure points, and can prevent back pain. A mattress that is too soft might cause the body to sink too deeply, disrupting the natural alignment of the spine. On the other hand, a mattress that is too firm may not provide enough cushioning for pressure points, leading to discomfort.

Adjusting the Foundation

One of the most straightforward ways to add firmness to your mattress is to check its foundation. A solid base can make a significant difference in the overall feel of your mattress.

Our Top 5 Mattress Picks

Updated September 2026
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1
Best Overall

EGOHOME 8-Inch Green Tea Memory Foam Mattress, Full, Medium Firm

Best for most bedrooms. A medium-firm green tea memory foam mattress with a cooling gel layer, delivered rolled in a box.

  • Full size, 8 in
  • Medium firm
  • Cooling green tea gel
  • CertiPUR-US, fiberglass free
Check Price on Amazon
2
2

OhGeni Queen Air Mattress with Built-in Pump, 18-Inch Raised

Best for guests and camping. Inflates in about three minutes with the built-in pump and sits 18 inches off the floor, so it feels like a real bed.

  • Queen, 18 in raised
  • Built-in pump
  • 800 lb capacity
  • Waterproof PVC
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3
3

Novilla 6-Inch Gel Memory Foam Mattress, Twin

Best budget twin. A slim gel memory foam twin that suits kids' rooms, bunk beds and trundles where a thick mattress won't fit.

  • Twin, 6 in
  • Gel memory foam
  • Cooling
  • CertiPUR-US
Check Price on Amazon
4
4

Zinus 8-Inch Green Tea Memory Foam Mattress, Twin

Best-known brand. Zinus's long-running green tea foam design in twin size, with both CertiPUR-US and OEKO-TEX certified materials.

  • Twin, 8 in
  • Green tea memory foam
  • CertiPUR-US & OEKO-TEX
Check Price on Amazon
5
5

GAESTE 8-Inch Cooling Gel Memory Foam Mattress, Full, Medium Feel

Best for hot sleepers. Cooling gel memory foam with a medium feel, plus a machine-washable, anti-slip cover you can actually clean.

  • Full size, 8 in
  • Medium feel
  • Cooling gel foam
  • Washable cover
  • Fiberglass free
Check Price on Amazon
As an Amazon Associate, Good Sleep Hub earns from qualifying purchases. Prices and availability are shown on Amazon.

Using Plywood

Placing a piece of plywood between the mattress and the box spring or bed frame can enhance support. Plywood provides a sturdy, flat surface that prevents sagging, which could be the reason behind the softness you’re experiencing. Just make sure the plywood is cut to match the size of your mattress, and cover it with a blanket to protect against splinters and dust.

Platform Beds

If you prefer a more permanent solution, consider switching to a platform bed. These beds have a solid or slated base designed to provide firm support for your mattress. If you’re using a slated base, ensure that the slats are close together to prevent the mattress from dipping.

Changing the Room Temperature

Mattresses made with materials like memory foam are temperature-sensitive. They become softer in warm conditions and firmer when it is cooler. To firm up a memory foam mattress, reduce the temperature in your bedroom. This can be done using air conditioning or by leaving the windows open if it’s cooler outside.

Adding a Mattress Topper

A firm mattress topper is a great way to adjust the comfort level of your bed without investing in a new mattress. There are many toppers available that are specifically designed to provide extra support and firm up a soft mattress.

Types of Firm Mattress Toppers

– Latex Toppers: These are known for their support and can add firmness to a sagging mattress.
– High-density Memory Foam Toppers: These toppers can give a firmer feel while still conforming to your body shape.
– Foam Toppers: There are various types of foam toppers with different firmness levels available to suit your needs.

Ensure the topper is the correct size for your mattress to avoid any gaps or overhang which could lead to an inconsistent sleep surface.

Maintaining Your Mattress

Regular maintenance can help retain the firmness of your mattress. One method is to flip or rotate it every 3 to 6 months to ensure even wear. However, be aware that not all mattresses are designed to be flipped; check with your mattress’s manufacturer instructions before doing so.

Clean Your Mattress Regularly

Regular cleaning can help keep your mattress in top shape. Dust mites, sweat, and other contaminants can break down the materials in your mattress over time, softening it. Vacuum your mattress regularly and spot clean any spills as soon as possible.

Check for Warranty and Sleep Trials

If your mattress is still within its warranty period or sleep trial, you may be able to get a replacement or refund. Check your mattress’s warranty conditions to see if excessive softening is covered.

When to Consider a New Mattress

While these fixes can prolong the life of your mattress and improve its firmness, they are temporary solutions. If your mattress is old or shows significant signs of wear, it might be time to invest in a new one. A mattress typically has a lifespan of 7-10 years, although this can vary depending on the quality and type of mattress.

Finishing Thoughts

In conclusion, while a soft mattress can be troublesome for your sleep and your spine, there are several practical measures you can take to make your mattress firmer. These include using plywood or a new bed base, adding a mattress topper, maintaining a suitable bedroom temperature, and looking after your mattress with regular maintenance and cleaning. If these adjustments and fixes don’t solve the issue, or if your mattress is old and worn out, it may be time for a replacement. Keep in mind the importance of sleep quality and the role a firm mattress plays in ensuring a good night’s rest. By taking the steps outlined above, you can fine-tune the firmness of your mattress for optimal comfort and support.

Author

  • Hello! I’m Dominic Johnson, the whimsical wizard behind the world of sleep at GoodSleepHub.com. With a background in Sleep Psychology and a quirky love for all things dozy and dreamy, I bring a sprinkle of fun to bedtime blues. I've spent my career unraveling the mysteries of the Sandman, turning dense science into cozy bedtime stories. When I'm not buried in research papers or testing the fluffiness of the latest pillows, I'm usually found playing impromptu lullabies on my old guitar for my twin daughters or teaching my labrador, Rocket, new tricks. My approach to sleep is simple: blend science with a touch of magic and a hearty laugh.

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