When shopping for a new mattress, one of the most important considerations is how to choose mattress firmness. But what does mattress firmness really mean, and how do you know which level is best for you? This guide breaks down the different mattress firmness levels, explains the key factors that influence firmness, and helps you find the perfect balance of comfort and support for your sleep needs.
What is mattress firmness?
Mattress firmness refers to how soft or hard a mattress feels when you lie on it. It’s the first impression you get, whether you sink in or feel more “on top” of the bed. Most mattress brands use a standard bed firmness scale, ranging from soft or plush to firm or extra firm. That said, mattress firmness is subjective: what feels soft to one person may feel firmer to another, depending on body weight, sleeping position, and personal preference.
Mattress firmness scale
Learn more about the feel of different mattress levels below.
Plush mattresses
Plush mattresses are soft with significant cushioning. They offer a contoured feel and are ideal for side sleepers.
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Medium mattresses
Medium mattresses, along with medium-plush and medium-firm mattresses, are all designed to offer balanced support and comfort. Mattresses in this medium range are the most popular firmness level as they are suitable for most sleepers, no matter their sleep position.
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Firm mattresses
Firm mattresses offer minimal sinkage and more support than medium mattresses. They are great for heavier sleepers, as well as back and stomach sleepers.
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Not sure which mattress is right for you? Take the Mattress Quiz and visit our Compare Mattresses page to find the best mattress for your sleep needs. Explore firmness scales, ergonomic support scales, and cooling scales for each mattress to easily compare your options.
How to choose mattress firmness and why it matters
Choosing the right mattress firmness is essential for spinal alignment, pressure relief, and overall sleep quality. The wrong firmness can lead to discomfort, pain, and restless nights. Here’s how firmness can impact sleepers.
Sleep position
Your sleep position is perhaps the most important factor in determining your ideal mattress firmness level.
Side sleepers often benefit from soft or plush mattresses, as they cushion the shoulders and hips while reducing pressure points.
All sleepers, including combination sleepers (those who change sleep positions during the night), may prefer a medium mattress that keeps them supported no matter their sleep style.
Back and stomach sleepers may find firm mattresses to be their ideal match, as firm beds keep your spine aligned and support your lower back throughout the night.
If you share a bed with your partner, but the two of you have different sleep styles, consider a medium mattress that is well-suited to most positions. Alternatively, consider choosing a split king bed made up of two twin XL mattresses. This way, each sleeper can choose a twin XL mattress in their preferred firmness level. Learn more about different mattress sizes in our Mattress Size Guide.
Body weight
A sleeper’s weight impacts how much they sink into a mattress. As such, plush mattresses may be more comfortable and supportive for light sleepers, whereas heavier sleepers may prefer firmer mattresses that provide better support. People of average weight will likely find the support offered by medium mattresses to be enough.
Support vs. firmness
It’s important to note that firmness and support aren’t the same. Firmness is the feel, while support is how well the mattress keeps your spine aligned. You can have a soft mattress that’s supportive, or a firm mattress that lacks proper support. Always look for a mattress that offers both comfort and support for your body type and sleep style.
Casper’s premium mattress collection uses innovative technology to ensure your best night’s rest, whether you’re a side sleeper, back sleeper, stomach sleeper, or something in between.
Signs that your mattress is too soft or too firm
If you’re having trouble sleeping, it’s possible that the firmness level is to blame.
Signs your mattress is too soft
- Waking up with lower back pain
- Feeling “stuck” in the bed
- Lacking support
Signs your mattress is too firm
- Pressure points at shoulders or hips
- Feeling of numbness
- Frequent tossing and turning to get comfortable
Want to make a firm mattress softer? Consider adding a mattress topper like the Casper Comfy Mattress Topper featuring three inches of premium foam.
If your mattress still doesn’t feel right, it’s possible that it’s time to replace your mattress altogether. Learn more about when to replace your mattress.
Final thoughts
Mattress firmness is a personal choice, but understanding different firmness levels and how they relate to your sleep style, weight, and comfort needs will help you make a confident decision. Remember, the best mattress for you is the one that keeps your spine aligned, relieves pressure points, and helps you wake up refreshed.
All Casper mattresses, including The Casper, the Original Hybrid, and the Wave Hybrid Snow are available in three firmness levels (Plush, Medium, and Firm), allowing you to find your perfect fit.
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FAQs
What firmness of mattress is best?
The best mattress firmness depends on your sleep position, body type, and personal comfort preferences. While side sleepers often prefer a softer feel for pressure relief, back, stomach, and combination sleepers typically find medium to firm mattresses offer a balance of comfort and support. If you're unsure, a medium mattress is a popular choice because it accommodates a wide range of sleepers and helps promote healthy spinal alignment.
What is the best mattress for couples who like different firmnesses?
The best mattress for couples with different firmness preferences is one that offers a balance of comfort and support for both sleepers. Medium mattresses are often a good compromise, but couples with significantly different needs may benefit from a split king mattress, which allows different firmness options on each side. Mattresses that reduce motion transfer, like The Casper, can also help ensure both partners sleep comfortably without disturbing one another. Discover the best mattresses for couples and learn more about different mattress sizes in our Mattress Size Guide.
What mattress firmness is best for side sleepers?
Side sleepers typically do best on a plush mattress or a medium mattress that cushions the shoulders and hips while keeping the spine aligned. A mattress that provides enough pressure relief can help reduce discomfort at common pressure points and promote more comfortable sleep throughout the night.
What is the most popular mattress firmness?
Most people prefer a medium mattress. This level offers a balance of comfort and support, making it suitable for a wide range of sleepers. That said, if you are a side sleeper, you may prefer the extra cushioning of a plush mattress. Oppositely, if you’re a back or stomach sleeper, a firm mattress might offer the support you require.
How do I know if my mattress is too firm or too soft?
If your mattress is too firm, you may wake up with pain or numbness in your shoulders, hips, or back. If it’s too soft, you might feel like you’re sinking in too deeply or notice lower back pain from a lack of support.
Can I make my mattress firmer or softer?
Yes, you can adjust the feel of your mattress with a mattress topper. A firm topper can add support to a soft mattress, while a plush topper can make a firm mattress feel softer. Rotating your mattress can also help. Learn more about mattress maintenance in our Ultimate Mattress Care Guide and shop the Casper Comfy Mattress Topper.
What mattress firmness is best for back pain?
A medium mattress, like The Casper Medium, Original Hybrid Medium, or Wave Hybrid Snow Medium, is often recommended for people with back pain because it provides both support and pressure relief. However, the best choice depends on your body type and sleeping position. Learn more about choosing the perfect mattress for your sleep style.
How long does it take to adjust to a new mattress firmness?
The mattress break-in period can last up to 90 days. Therefore, it can take a few weeks or even a couple of months for your body to adjust to a new mattress. That’s why Casper offers a 100-night sleep trial on all mattresses. This way, you can test the firmness at home and exchange it if needed.
Casper Canada offers free delivery and easy returns. If the mattress you buy isn’t a perfect fit, you can return it for free within the trial period. Simply contact our customer service team, and we’ll arrange a date to pick it up from your home. We’ll then recycle the mattress or donate it. Read more about the Casper Return Policy.
