How to Choose a Mattress: Firmness, Materials, and Trial Periods to Compare
Finding the right mattress is one of the most important decisions you can make for your sleep quality and overall well-being. Yet with so many options available—different firmness levels, materials, and brands—the choice can feel overwhelming. This guide will walk you through the essential factors to consider so you can make an informed decision that works for your body, sleep style, and budget.
A good mattress supports your spine, relieves pressure on sensitive areas like your shoulders and hips, and lets you wake up without pain or stiffness. But what feels perfect for one person might feel wrong for another, which is why understanding your own needs is the starting point.
Understanding the Firmness Scale
Professional mattress ratings follow a 1-10 firmness scale, but this scale lacks universally agreed definitions. Most brands use their own interpretations, so it helps to know what each range generally means:
- Soft (1-4): Surface sinking depth of 3 or more inches with a cloud-like feel
- Medium (5-6): A balance between cushioning and support, suitable for many sleepers
- Medium-Firm (6-7): Among the most popular firmness levels, offering more stability than medium mattresses but still providing a cushioned feel
- Firm (8-10): Minimal sinking with a more rigid surface that supports heavier bodies
Understanding manufacturer-specific interpretations is essential when comparing mattresses. What one brand calls "medium" may feel different from another brand's version. Always check how a manufacturer describes their scale before making your choice.
Choosing Firmness Based on Sleep Position
Your sleeping position is the most important starting point for narrowing down firmness. Different positions place pressure on different parts of your body, which means you need different levels of support:
Side Sleepers 😴
Side sleepers typically benefit from soft to medium mattresses (around 4-6 on a 10-point firmness scale), which allows for 2-3 inches of contouring that keeps ears, shoulders, and hips in proper alignment. A mattress that is too firm will create uncomfortable pressure points on your shoulders and hips, while one that is too soft will let your torso sink and misalign your spine.
Back Sleepers
Back sleepers put the greatest pressure on their lower back. If a mattress is too soft, the torso can sink in more deeply than the upper back and lower body, creating strain. If a mattress is too firm, there won't be any accommodation of the slight curve in the lower back. Most back sleepers land in medium plush to medium firm (5-7) on the firmness scale.
Stomach Sleepers
Stomach sleepers should be steered toward beds in the 7 and higher on the 1 to 10 firmness scale. Stomach sleepers often prefer a more supportive surface because too much sink through the hips can create an uncomfortable sleeping position.
Combination Sleepers
If you turn over frequently, you'll want to make sure you can get comfortable on your mattress in any position. A medium-firm mattress may offer just the right blend of comfort and support.
How Body Weight Affects Your Firmness Needs
Your body weight significantly influences how a mattress will feel and perform. A mattress that works well for a lighter person may feel too soft for a heavier sleeper, and vice versa.
| Weight Range | General Firmness Adjustment | Why |
|---|---|---|
| Under 130 pounds | Choose one level softer than your position suggests | Lighter sleepers do not sink into mattresses as much, so softer options prevent the feeling of sitting on top of the bed |
| 130 to 230 pounds | Follow your sleep position guidelines | Average weight allows position-based recommendations to work well |
| Over 230 pounds | Choose one level firmer than your position suggests | Heavier sleepers compress materials significantly more, so firmer surfaces maintain proper support |
Mattress Materials and How They Feel
Your mattress's materials significantly impact how firm or soft it feels. Understanding the main types will help you find the right balance of comfort and support:
Memory Foam
Memory foam mattresses typically offer sinkage, contouring, and cushioning to cradle and take pressure off sensitive areas like the hips, shoulders, and lower back. These mattresses conform closely to your body shape, which many sleepers find comforting.
Hybrid Mattresses
Hybrid mattresses combine coils that provide sturdy support and lift with foam layers that offer cushioning and contouring. This combination gives you responsive bounce with pressure relief.
Latex
Latex mattresses consist of latex foam, which is a bouncy, durable, cooling and eco-friendly material. Latex doesn't offer deep sinkage like memory foam, but it does provide contouring that many sleepers enjoy.
Innerspring (Coil) Mattresses
Innerspring mattresses tend to feel firmer because their coils provide sturdy support and lift. These traditional mattresses are often less expensive but offer less pressure relief than foam or hybrid options.
Understanding Trial Periods and Return Policies
A mattress trial period allows you to sleep on a new bed for an extended time—usually ranging from 90 to 365 nights. This is crucial because trial periods enable you to literally sleep on your decision.
However, not all trial periods are equal. Common return policy conditions include a minimum use requirement (often 30 nights), return fees (some charge $75–$200), donation requirements (proof that you donated the mattress), and exchange-only policies (credit towards another model instead of a refund).
Key Conditions to Check 🔍
- Minimum use requirement: Some brands require you to sleep on the mattress for at least 30 days before you can initiate a return. This "break-in period" is standard and allows your body time to adjust.
- Return fees: Some charge $99 or more in pickup and processing fees.
- Free pickup: Confirm whether the company covers return shipping or if you pay for it.
- Full refund vs. exchange: Some companies offer store credit only, rather than returning your money to your original payment method.
- Condition requirements: Most mattress return policies require you to return the mattress in a clean condition within the trial period. It's important to invest in one of the best mattress protectors to keep the bed clean just in case you do need to return it; if the mattress is stained or damaged, you won't be eligible for a return or exchange.
Comparing Trial Lengths and Fees
The average mattress trial is 100 nights, but brands like Saatva, DreamCloud and Nectar Sleep offer 365-night trials. Here's what to expect from common retailers:
| Brand Type | Typical Trial Length | Typical Return Fee | Typical Break-In Period |
|---|---|---|---|
| Direct-to-consumer brands | 100 to 365 nights | Free to $99 | 30 days (sometimes none) |
| Mattress Firm and retail chains | 90 to 120 nights | $99 to $249 (often exchange-only) | 21 to 30 days |
| Department stores | Varies widely | Often charges or offers exchange only | Varies |
| Warehouse clubs (e.g., Costco) | No fixed deadline | Free | None |
For a true no-cost return, the best mattress return policies belong to brands that charge nothing and pick the bed up for free: Nectar's 365-night trial, Casper, Purple, and Tuft & Needle all refund in full with no return fee.
What to Look for When Testing a Mattress
A way to gauge the correct firmness for you is to lie on your back. If you can slide your hand under the small of your back fairly easily, then it's just right. If the gap is larger and your hand goes through too easily, the mattress could be too hard for you. Or if it's a struggle to get your hand through, then it could be too soft.
If you're a side sleeper, you should be able to feel the mattress from your ribs to your pelvis. If you can't, then it could be too firm. But if you're sinking in and can feel pressure on your hips, then it could be too soft for your body in that position.
Making Your Final Decision
Sleeping position should not make the entire decision. Your body type, preferred feel, pressure sensitivity, partner and mattress construction all matter too. For most shoppers, we recommend identifying your primary sleeping position first, then comparing two or three comfort levels in that range.
Use the trial period as your safety net. While a good mattress feel is important in a showroom, how it performs over weeks and months in your own bedroom is what truly matters. Give yourself at least several weeks to adjust, and only return it if it's genuinely not working for your sleep.
Choosing a mattress requires balancing firmness, materials, your body weight, and your sleep position—plus factoring in which trial period and return policy give you confidence in your purchase. By understanding each element and taking advantage of a trial period, you can find a mattress that supports better sleep for years to come.