Making a soft mattress firmer can be approached in a variety of ways. To achieve a firmer feel, you can use a firm mattress topper, place plywood or a bunkie board between the mattress and the base, adjust the room temperature, flip or rotate the mattress if it’s double-sided, replace worn-out layers, inspect and possibly replace the box spring or foundation, or even consider getting a new firmer mattress if your current one is aging and losing support. These initial steps can help enhance the firmness, but it’s important to look at each in detail to understand how they can effectively firm up your sleep surface.
Understanding Mattress Firmness
Importance of Firmness in Mattresses
The firmness of a mattress plays a crucial role in sleep quality. It affects comfort levels, spinal alignment, and can significantly impact your overall sleep experience. A mattress that is too soft for your body type or sleep position preferences can lead to poor sleeping posture, resulting in back pain and discomfort. Conversely, a mattress that is too firm can create pressure points and minimize the quality of rest.
Why Mattresses Might Feel Too Soft
There are several reasons why your mattress may feel too soft. Over time, the materials in the mattress may break down and lose their supportive qualities. Weight changes, either from the sleeper or an increase in mattress usage, can also alter the feel. Additionally, environmental factors such as humidity and temperature can affect the firmness level.
Different Methods to Make a Mattress Firmer
Now, let’s discuss the various methods you can employ to achieve the desired firmness for a comfortable night’s sleep.
Our Top 5 Mattress Picks
Updated September 2026EGOHOME 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
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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
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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.
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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
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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
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- Fiberglass free
1. Use a Firm Mattress Topper
Adding a firm mattress topper is one of the easiest ways to change the comfort level of your bed. These toppers come in a variety of materials, including memory foam, latex, or high-density polyurethane foam, each offering a different firmness level and feel.
2. Place Plywood or a Bunkie Board Between the Mattress and Base
For a sagging mattress, placing a solid or slatted support such as plywood or a bunkie board beneath the mattress can increase firmness. This provides a uniform support system, countering the sag and giving a firmer sleeping surface.
3. Adjust the Room Temperature
Some mattress materials, especially memory foam, are temperature sensitive. If the room is too warm, the material may soften. Cooling down the room can make the foam feel firmer.
4. Flip or Rotate the Mattress
If your mattress is dual-sided, flipping it over can provide a firmer feel, especially if one side has seen less use. Rotating a mattress 180 degrees can also help if there are unused areas that might be firmer.
5. Replace Worn-Out Layers
Some mattresses come with layers that can be replaced independently of the entire mattress. Check if your mattress has this feature and consider replacing the softened upper layers with firmer, new ones.
6. Inspect and Replace the Foundation if Necessary
An old, worn-out box spring or foundation may not provide the necessary support, causing the mattress to feel softer. Inspecting and potentially replacing your foundation can restore the desired level of firmness.
7. Consider a New Mattress
If your mattress is old, it may be time to consider replacing it entirely. Newer mattresses come with modern materials and construction that can offer lasting firmness and support.
Choosing the Right Solution for You
Assessing the Current Condition of Your Mattress
Before you decide to invest in making your mattress firmer, assess its current condition. Check for any noticeable sagging, wear and tear, or damage to the internal structure. If your mattress is in relatively good shape with no major defects, then the above methods can be effective.
Considering Personal Comfort Preferences
Everyone’s comfort preferences differ. Some might require a firmer surface due to body weight or health conditions such as back pain, while others might want it for personal comfort. Knowing why you want a firmer mattress can help you choose the appropriate solution.
Understanding Your Budget
Your budget will largely dictate the best course of action. While buying a new mattress might be the ultimate solution, it’s also the most expensive. On the other hand, a mattress topper or a bunkie board is a more cost-effective alternative.
Knowing the Type of Mattress You Own
The type of mattress you own can also influence your choice of method for firming up your mattress. For example, memory foam, innerspring, latex, or hybrid mattresses will each respond differently to the strategies suggested above.
Maintenance Tips for Prolonged Mattress Firmness
Regular Rotation and Flipping
Regular rotation and, if applicable, flipping of your mattress can help maintain even wear and extend its firmness life span.
Protective Covers
Using protective mattress covers can help safeguard against spills and contaminants that could potentially break down the mattress materials, ultimately affecting the firmness.
Proper Base and Frame Support
Ensuring that your mattress sits on a proper base or frame is vital for maintaining firmness and support. Whether it is a platform bed or a box spring, the base’s structural integrity is key to a firm mattress.
Climate Control
Maintaining a relatively cool, dry bedroom environment can help retain the firmness of heat-sensitive materials like memory foam.
Finishing Thoughts
Finding the perfect firmness for your mattress is essential for good sleep hygiene and can have a significant impact on your overall sleep quality and health. The methods outlined above can help you firm up a mattress that feels too soft, whether it’s a simple fix like adjusting the room temperature or a more significant change like adding a supportive topper or replacing the foundation. It’s important to consider your personal preferences, your mattress’s condition, and your budget when choosing how to proceed. Remember that proper maintenance such as regular rotation and using protective covers can also play a crucial role in maintaining the desired firmness of your mattress over time. With the right approach, you can extend the life of your mattress and ensure that your sleep surface remains supportive and comfortable for years to come.
