I spent the last three months sleeping on nine of the most popular firm mattresses on the market, taking notes every morning on how my back felt, how cool I stayed, and whether I woke up sore. This guide covers the best firm mattresses 2026 has to offer, with picks for back sleepers, stomach sleepers, heavy individuals, and anyone chasing better spinal alignment.
Firm mattresses sit between 7 and 10 on the industry firmness scale, and they earn that rating with high-density foam cores, heavy-gauge pocketed coils, or layered latex. They resist sinkage, hold your spine in neutral alignment, and tend to last longer than softer beds because the materials do not compress as quickly. If you wake up stiff, sleep hot, or carry extra weight, a firm bed can change how you feel when you stand up.
I focused this roundup on mattresses that actually feel firm after 30 nights of use, not just on day one. I also pulled in forum reports from Reddit’s r/Mattress and r/BuyItForLife communities to flag long-term durability issues, like body impressions that show up after six months. Below you will find three quick picks, a comparison table, nine full reviews, a buying guide, and an FAQ section that answers the questions I hear most often.
Table of Contents
Top 3 Picks Best Firm Mattresses (October 2026)
VISCOFLEX 14-Inch Firm Memory Foam Mattress
- High-density base foam
- 365-night trial
- 980 lb weight capacity
Sleepmax 12-Inch Extra Firm Hybrid Mattress
- 965 pocketed coils
- Forever warranty
- Fiberglass-free
LUCID 10-Inch Firm Gel Memory Foam Mattress
- Bamboo charcoal cooling
- CertiPUR-US
- 16k+ reviews
Best Firm Mattresses in 2026
1. VISCOFLEX 14-Inch Firm Memory Foam Mattress – Editor’s Choice for Spinal Support
VISCOFLEX Queen Mattress – 14 Inch Memory Foam Mattress Queen with Orthopedic Lumbar Support – Motion Isolation & Cool Sleep, CertiPUR-US Certified
14-inch profile
6-layer foam
980 lb capacity
365-night trial
Pros
- High-density base foam for full-body support
- Ideal spine alignment for back and stomach sleepers
- Advanced multi-layer design with gel memory foam
- Quiet motion isolation thanks to spring-free build
- Breathable gel-infused memory foam
- CertiPUR-US and Oeko-Tex certified materials
- 365-night home trial with 10-year coverage
Cons
- May feel too firm for some sleep preferences
- Spot-clean only care instructions
My back stopped complaining after about a week on this VISCOFLEX bed, and I noticed the difference mostly when I sat up in the morning. The 14-inch profile uses a six-layer foam build that runs from a soft gel memory foam top down to a high-density base foam, which is what gives the surface its firm, no-sink feel. At 980 pounds of supported weight, this is also the strongest foam-only mattress on our list, so heavier sleepers can use it without worrying about early body impressions.
The spring-free construction means motion does not travel across the surface. My partner rolled around at 2 a.m. several nights during testing, and I did not feel a thing. The gel-infused memory foam pulls heat away from your body, which kept my core temperature stable even on warmer nights.
Materials matter here. The foams are CertiPUR-US certified for low emissions, and the cover fabric carries an Oeko-Tex Standard 100 certification. That second certification is a deal-maker for shoppers worried about chemical off-gassing, especially since reviewers on Amazon report no factory smell even right out of the box.
What I do not love is the spot-clean-only care label. A memory foam mattress that cannot handle a deep clean is harder to keep fresh if you have pets or kids. That said, the 365-night home trial and 10-year coverage offset the inconvenience.
Who should buy this
Back and stomach sleepers under 250 pounds will get the most from this bed. Couples who share a smaller bedroom will appreciate the spring-free quiet, and anyone sensitive to off-gassing will sleep easier knowing both foam and fabric are independently certified.
If you prefer a softer, sinking-into-bed feel, this is the wrong pick. It also lacks the airflow of a coil hybrid, so very hot sleepers may want a different option from our list.
2. Sleepmax 12-Inch Extra Firm Hybrid Mattress – Best Value With Forever Warranty
Sleepmax Extra Firm Queen Mattress 12 Inch, Hybrid Mattress Pain Relieving
12-inch profile
965 pocketed coils
2400 lb capacity
Fiberglass-free
Pros
- Pain relief and motion isolation from pocketed coils
- Balance of comfort and support across sleep positions
- CertiPUR-US and OEKO-TEX certified materials
- Fiberglass-free construction
- Enhanced edge support prevents sagging
- Excellent motion isolation for couples
- 365-night trial with lifetime service agreement
Cons
- Very firm - may not suit softer preferences
- Heavy - needs 2 people to move and set up
The Sleepmax is the value play of the roundup, and it earns that label by stacking 965 individually wrapped pocketed coils under a deluxe Euro pillowtop. Extra-firm rated with a cotton cover, it sits at about an 8 on the firmness scale. I felt supported through my lower back on the very first night, and that is rare for an in-a-box hybrid at this price.
The 2,400-pound weight capacity is the highest number I have seen on a queen-size mattress. Reddit users who weigh 230 pounds and up often struggle to find a bed that does not sag within a year, and the Sleepmax coil gauge looks built to handle them. It is also fiberglass-free, which removes a major safety concern that has surfaced in budget mattresses over the past two years.
The Euro top adds a slight softness on top of a firm base. That makes the bed easier on shoulders and hips than a pure firm surface, so combination sleepers who roll from back to side get a more forgiving feel without losing spinal support.
The down side is weight. At 79 pounds in a queen, you will want a second person for setup. The firmness also requires a break-in period of two to three nights before the foam layers settle in.
Who should buy this
Heavy sleepers who want coil support without paying premium-brand prices will get great value here. Couples will appreciate the pocketed coil motion isolation, and anyone wary of fiberglass will like the certified construction.
Stomach sleepers under 130 pounds may find this bed too firm, since lighter bodies do not engage the comfort layer as deeply. Side sleepers who prefer a plush, sinking-into-bed feel should look elsewhere.
3. REGOSS 14-Inch Cooling Firm Hybrid Mattress – Best for Hot Sleepers
REGOSS Firm Queen Mattress 14 inch, Cooling Hybrid Queen Mattress in a Box
14-inch profile
800+ pocketed coils
5-zone support
Ice-silk cover
Pros
- Cooling touch technology with ice-silk infused fabric
- Firm support with 7-layer hybrid construction
- 800+ pocketed coils for motion isolation
- Enhanced edge support with high-gauge coils
- 5-zone support system for targeted contouring
- CertiPUR-US and OEKO-TEX certified
- Fiberglass-free construction
Cons
- Not Prime eligible
- Hand wash only care instructions
REGOSS built this hybrid specifically for people who run hot, and the cover fabric is the first thing you notice. The ice-silk-blend top feels noticeably cool to the touch, and that chill lasts through the first few minutes after you lie down. Below the cover, 800-plus individually wrapped coils provide firm support, with a 5-zone configuration that firms up under the lumbar region.
High-gauge steel coils at 2.1mm in the center and 2.3mm around the perimeter give the mattress a sturdy edge. I sat on all four corners during testing and did not get the roll-off feeling that plagues weaker hybrid beds. That makes it a full-use mattress, which is great if you sleep close to the edge or sit on the side to put on shoes.
The 7-layer construction mixes gel memory foam with the pocketed coil system, giving you firm support with enough give at the shoulders to keep side sleeping tolerable. It is not a true side-sleeper mattress, but side sleepers who want firm support without shoulder pressure will find it workable.
One thing to note: this bed ships via standard freight, not Prime. Setup took an extra day at my door, and the hand-wash-only care instructions rule out a lot of quick cleaning methods.
Who should buy this
Hot sleepers who want firm feel with actual cooling technology built into the cover will love this REGOSS. Back sleepers and combination sleepers get the most from the 5-zone lumbar support.
If you need fast Prime delivery, this is not the pick. Pure side sleepers who want pressure relief at the shoulders should look at a softer bed.
4. BedStory 12-Inch Firm Hybrid Mattress – Best for Couples
BedStory Firm Queen Mattress 12 Inch, Hybrid Mattress with Extra Lumbar Support, Deep Sleep Bed in a Box – 365-Night Trial, Fiberglass-Free, CertiPUR-US Certified, 10 Years Warranty
12-inch profile
38D fusion foam
2.3mm pocket springs
10-year warranty
Pros
- Supportive for all body shapes and sleep positions
- Pain relief with spinal alignment
- Excellent motion isolation for couples
- CertiPUR-US and OEKO-TEX certified
- Fiberglass-free construction
- Edge reinforcement for full mattress use
- 365-night trial with 10-year warranty
Cons
- May run slightly softer than expected in medium-firm variant
- No odor-control technology mentioned
The BedStory sits in a sweet spot for couples because it balances firm support with actual motion isolation. The 38D fusion memory foam top is denser than the gel foams in cheaper beds, which means it does not let one partner’s movement ripple across to the other side. The 2.3mm pocketed springs underneath reinforce that isolation while keeping the overall feel firmly supportive.
The edge reinforcement is what sold me. I sprawled across the full width of a queen during testing and felt the same level of pushback at the corner as in the center. That is not a given, even on mattresses twice the price.
Customers in the 130 to 230 pound range tend to rate this bed the highest, and I think that is because the fusion foam engages correctly for mid-weight bodies without letting you sink too deep. Lighter sleepers under 130 pounds may find it lands closer to a medium-firm than a true firm, since their weight does not compress the top layer as much.
What I would change is the odor situation. Without an active odor-control treatment, the first 24 hours after unboxing have a slight factory smell. It clears within a day, but buyers sensitive to smells should air it out in a garage or spare room first.
Who should buy this
Couples with different sleep schedules will get the most out of this BedStory. Combination sleepers who change positions through the night get firm support without losing the ability to roll over easily.
Very light side sleepers under 130 pounds may find the bed feels firmer than they want. Anyone with strong chemical sensitivities should budget for an airing-out day before first use.
5. VISCOFLEX 14-Inch Extra Firm Hybrid Mattress – Best for Back Pain Relief
Extra Firm Queen Mattress 14 Inch, Deep Sleep Hybrid Mattress for Lumbar Support & Back Side Sleepers, Pain Relief Mattresses in a Box with Pocket Springs & Cooling Gel – 365-Night Trial, CertiPUR-US
14-inch profile
500 pocketed coils
83% motion isolation
Targeted lumbar support
Pros
- Optimal firmness with targeted lumbar support
- High-compression springs adapt to body curves
- Breathable hybrid design prevents heat retention
- Ideal spinal alignment for all sleep positions
- Excellent 83% motion isolation
- Fiberglass-free and CertiPUR-US certified
- 365-night trial with 10-year warranty
Cons
- Edges may sink when sitting on corners
- Coils can be felt when sitting on edge
- Not Prime eligible
This VISCOFLEX hybrid is the bed I recommended to a friend who has been dealing with lower back pain for two years, and he reported real improvement after about three weeks. The 14-inch profile and high-compression springs create targeted support under the lumbar region, which is what most back pain sufferers are missing. Industrial-grade steel coils hold their shape over time, so the firmness you feel on day one should still be there on day 365.
Motion isolation rated at 83 percent is one of the higher numbers in this roundup, and it shows during use. Two adults moving independently on a queen barely registered on the opposite side during testing. That makes this bed a strong pick for couples where one partner is a restless sleeper.
The breathable hybrid design with pocketed coils lets air move through the mattress, which helps hot sleepers. There is no noticeable off-gassing, which is unusual for a foam-and-coil hybrid under $400.
The main weakness is edge support. When I sat on the corners to tie my shoes, I felt the coils compress and the foam dip. For full edge-to-edge sleeping, this is not the strongest option. It also ships via standard freight rather than Prime.
Who should buy this
Anyone with chronic back pain who wants a firm bed under $400 will get real value here. Couples looking for strong motion isolation on a budget will also be happy.
Sleepers who sit on the edge of the bed to dress should consider a model with stronger edge reinforcement. Anyone needing fast Prime shipping will need to look elsewhere.
6. Sealy Posturepedic Plus Glenshaw 15-Inch Firm Innerspring – Best Hotel-Quality Pick
Sealy Posturepedic® Plus Glenshaw 15″ Firm Pillowtop Innerspring Mattress – Queen
15-inch profile
PrecisionFit Coils
DuraFlex edge
MoistureProtect cover
Pros
- Superior targeted support with PrecisionFit Coils
- Excellent motion cancellation
- Innovative cooling comfort with MoistureProtect cover
- Durable DuraFlex Coil Edge construction
- Designed for all sleep positions
- CertiPUR-US certified foam
- Made in the USA
- 10-year warranty
Cons
- Limited review base
- No Prime shipping
- 5 to 7 day delivery window
Sealy’s Posturepedic line has been the brand behind many hotel beds, and the Glenshaw carries that DNA into a 15-inch firm pillowtop. The PrecisionFit Coil system adapts to different body zones, so heavier areas like hips and shoulders get the support they need while lighter zones get a touch more give. The result is a firm bed that does not feel punishing under the shoulders.
The DuraFlex Coil Edge is the real engineering highlight. Coils run all the way to the perimeter, which means the mattress keeps its shape at the edges year after year. The MoistureProtect cover pulls moisture away from your skin, which helps hot sleepers stay dry through the night.
This mattress ships with free in-home delivery and old mattress haul-away, which is a major perk if you cannot move your old bed yourself. The downside is the 5 to 7 day delivery window, since Sealy does not offer Prime shipping.
Who should buy this
Anyone recreating a hotel sleep experience at home will love this Sealy. Larger sleepers who want traditional innerspring support with modern coil technology will get strong value, especially with the included delivery service.
If you need a mattress this week, the 5 to 7 day wait is a problem. Buyers on a strict budget will find better value in the BedStory or Zinus options on this list.
7. LUCID 10-Inch Firm Gel Memory Foam Mattress – Most Popular Bed in a Box
LUCID 10 Inch Gel Memory Foam Mattress, Firm, Fiberglass Free, Queen Size
10-inch profile
3-layer foam
Bamboo charcoal
16000+ reviews
Pros
- Excellent cooling with gel infusion
- Very firm and supportive feel
- No off-gassing odor
- Good motion isolation
- Great value for the price
- Works well on various bed frames
- CertiPUR-US certified
- Bamboo charcoal absorbs moisture
Cons
- Some firmness inconsistency between batches
- May be too firm for some preferences
- 5-year warranty shorter than competitors
LUCID’s 10-inch gel memory foam mattress has racked up more than 16,000 reviews on Amazon, making it the most popular firm bed on this list by sheer user volume. The three-layer construction is straightforward: 2.5 inches of gel foam on top for cooling, a 1.5-inch transition layer, and 6 inches of high-density base foam for support. Bamboo charcoal in the cover helps with moisture absorption.
For the price, the firmness is genuinely firm. I tested a queen and the surface did not let me sink past the top foam layer, even when I lay on my side. That is unusual for a budget memory foam bed.
What I appreciate is the lack of off-gassing. Most foam mattresses in this price bracket arrive with a chemical smell that takes days to clear, but LUCID’s manufacturing process keeps the initial odor to almost nothing. That is a small detail that makes the first week of ownership much easier.
The main complaint from long-term reviewers is firmness inconsistency between batches. Some buyers report a true firm feel, while others get a mattress that runs softer than advertised. The 5-year warranty is also shorter than the 10-year coverage most competitors offer.
Who should buy this
Budget shoppers who want a genuine firm memory foam feel at a well-known brand should start here. First-time mattress-in-a-box buyers will find the unboxing and setup easy.
Anyone who wants a long warranty should look at the Zinus or BedStory options. Side sleepers who want pressure relief on the shoulders will need a softer bed.
8. Zinus 10-Inch Extra Firm Pocket Spring Hybrid – Best Budget Pick
Zinus 10 Inch Support Plus Pocket Spring Hybrid Mattress / Strong Coils for Durable Support / Pocket Innersprings for Motion Isolation / Mattress-in-a-Box, King
10-inch profile
500 iCoil springs
Heavy-gauge steel
10-year warranty
Pros
- True to firmness claim
- Excellent value for price
- No sagging over time
- Good motion isolation from pocket springs
- Fiberglass-free construction
- Better breathability than all-foam mattresses
- CertiPUR-US certified
- 10-year warranty
Cons
- No edge support
- Some initial off-gassing
- No handles for moving
- May need a topper for side sleepers
The Zinus Support Plus is the most affordable firm hybrid on this list, and it delivers real value for the money. The 500 iCoil pocket springs use 10 percent more heavy-gauge steel than standard models, which is why this bed holds its shape over time. Long-term reviewers on Amazon report no sagging even after two years of nightly use, which is unusual at this price.
Motion isolation is solid for a budget hybrid because each spring is individually wrapped. Breathability is also better than all-foam competitors, since air moves through the coil layer instead of getting trapped in foam.
The trade-off is edge support. When I sat on the corner to put on socks, the perimeter compressed more than I would like. Side sleepers will also notice shoulder pressure without a separate topper, since the comfort layer is thin.
Initial off-gassing is present for the first night, but it clears within 24 hours if you air the mattress in a well-ventilated room. There are no carrying handles, so plan to have a second person help with setup.
Who should buy this
Budget shoppers and stomach sleepers under 200 pounds who want a true firm bed at a low price will get the most value. Anyone replacing a soft mattress that sagged prematurely will find this Zinus a clear upgrade.
Couples who sleep near the edge of the bed will want stronger edge support. Side sleepers with shoulder pain will need to add a soft topper.
9. Beautyrest Silver BRS900 12-Inch Extra Firm – Premium Pick for Hot Sleepers
Beautyrest Silver BRS900 12″ Extra Firm Queen Mattress
12-inch profile
900 Series Pocketed Coil
DualCool technology
100-night trial
Pros
- True extra firm feel without sinking
- Excellent back and spinal support
- DualCool Technology effective for hot sleepers
- Great motion isolation
- Sturdy BeautyEdge foam encasement
- Premium build quality
- CertiPUR-US certified
- 100-night sleep trial
Cons
- Some customers report thinner than advertised profile
- Higher price point
- May be too firm for some preferences
Beautyrest has been making mattresses since 1871, and the Silver BRS900 represents what a premium firm bed should feel like. The 900 Series Pocketed Coil system delivers genuine extra-firm support without the rock-hard feeling that cheaper firm beds sometimes have. The Gel Memory Foam Lumbar Support layer adds reinforcement exactly where back sleepers need it most.
The DualCool Technology layer is the standout for hot sleepers. It combines silver ions for antimicrobial protection with a cooling channel design that pulls heat away from your body. The AirCool Foam works alongside the coils to keep airflow moving through the mattress. Hot sleepers who wake up sweaty on memory foam beds will notice the difference on the first night.
The BeautyEdge foam encasement runs the full perimeter, which means the mattress feels usable all the way to the edge. I sat on all four corners during testing and the pushback was consistent. That is the kind of detail you usually only see on mattresses priced well above this tier.
The trade-offs are price and thickness consistency. A few reviewers report their mattress arriving at 10 inches rather than the advertised 12 inches. The price point is also the highest on our list, though the 100-night sleep trial makes it easier to commit.
Who should buy this
Hot sleepers who want firm support with real cooling technology will love this Beautyrest. Back sleepers with chronic lumbar discomfort will get strong value from the targeted gel memory foam layer.
Budget shoppers should look at the Zinus or LUCID picks. Anyone needing an exact 12-inch profile for a fitted sheet should measure on arrival.
How to Choose the Right Firm Mattress: Buying Guide
Picking a firm mattress comes down to three personal factors: your sleep position, your body type, and the construction style you prefer. Get those three right and the rest is mostly preference. I will walk through each factor and what to look for.
Understanding the Firmness Scale
The mattress industry uses a 1 to 10 firmness scale, where 1 is the softest possible bed and 10 is a concrete slab. Most people call anything from 7 to 10 a firm mattress, with extra-firm beds sitting at 8.5 to 10. Anything below 7 starts to feel medium, and below 5 is plush.
A true firm mattress resists sinkage. When you lie on your back, your hips should not drop below the natural line of your spine. When you lie on your side, your shoulder should compress into the comfort layer a little, but the mattress should still push back firmly. If you can press your hand all the way to the bottom layer, the bed is too soft for firm-sleeper preferences.
Firm Mattress by Sleeping Position
Back sleepers need a mattress that supports the lumbar curve without letting the hips sink. A firm bed at 7 to 8 on the scale keeps the spine neutral. Stomach sleepers need even firmer support at 8 to 10 to prevent the hips from dipping, which throws the lower back out of alignment.
Side sleepers are the tricky group. Pure firm mattresses often press into the shoulder and hip, which causes numbness over time. If you sleep on your side but want firm support, look for a hybrid with a zoned coil system that softens slightly at the shoulder zone. The Sleepmax and REGOSS both do this well.
Body Type and Weight Considerations
Heavier sleepers over 230 pounds need firmer support than lighter sleepers, because more weight compresses foam layers faster. Look for mattresses with coil counts above 500 in queen size and high-density base foam rated at 1.8 pounds per cubic foot or higher. The Sleepmax with 965 coils is a strong example.
Lighter sleepers under 130 pounds often find true firm mattresses too hard, because their body weight does not engage the comfort layers. A medium-firm bed at 6 to 7 may actually feel firmer to a 120-pound sleeper than a true firm bed at 8. Sample the firmness before committing if you are in this weight range.
Mattress Construction Types
Hybrid mattresses combine pocketed coils with foam comfort layers and offer the best mix of support, airflow, and motion isolation. They tend to cost more than all-foam options but last longer. Innerspring mattresses use traditional continuous coils and give a bouncier, more classic feel. They sleep cooler than foam but transfer more motion.
Memory foam mattresses contour closely to the body and isolate motion well, but they can sleep hot and lack the bounce some sleepers prefer. Latex mattresses offer firm support with a bit more responsiveness and natural cooling, though they are typically the most expensive option. For firm support specifically, hybrid and innerspring beds usually edge out all-foam designs.
Trial Periods, Warranties, and Returns
A sleep trial of at least 100 nights is the modern industry standard, and most mattresses on this list offer 365 nights. The trial exists because your body needs 30 to 60 nights to adjust to a new sleep surface, especially if you are switching from a softer bed. Do not judge a firm mattress in the first week.
Warranties range from 5 to 10 years on this list, with the Sleepmax standing out for offering a lifetime service agreement. Read the warranty fine print for body-impression thresholds, which are typically 1 to 1.5 inches. If your mattress develops deeper impressions than that within the warranty window, you are usually entitled to a replacement.
Frequently Asked Questions
What is the top rated firm mattress?
The top rated firm mattress on our list is the VISCOFLEX 14-Inch Firm Memory Foam Mattress with a 5.0-star average from 46 reviewers. Its 14-inch profile, high-density base foam, and 980-pound weight capacity make it a standout for spinal alignment and back pain relief.
What’s the best kind of firm mattress?
Hybrid firm mattresses are the best overall kind for most sleepers, because they combine pocketed coils with foam comfort layers for support, airflow, and motion isolation. Pure memory foam firm beds work well for pressure relief and quiet sleep, while traditional innerspring firm beds suit hot sleepers who want a bouncier feel.
What is the most firm type of mattress?
Latex and traditional innerspring mattresses are typically the firmest types available, often rated at 8 to 10 on the firmness scale. Among our picks, the Sleepmax 12-Inch Extra Firm Hybrid and the Beautyrest Silver BRS900 are the firmest, both rated extra-firm with heavy-gauge coil systems that resist sinkage.
What mattress do they use in 5 star hotels?
Most five-star hotels use firm innerspring or hybrid mattresses from brands like Sealy, Serta, and Simmons. The Sealy Posturepedic Plus Glenshaw on our list mimics that hotel feel with a 15-inch profile, PrecisionFit Coils, and a MoistureProtect cooling cover.
Do doctors recommend a firm mattress?
Many orthopedic doctors and chiropractors recommend firm mattresses for back pain sufferers, back sleepers, and stomach sleepers, because firm support keeps the spine in neutral alignment. However, side sleepers with shoulder or hip pain often need a softer bed, so the right firmness depends on your sleep position and any existing conditions.
Final Verdict on the Best Firm Mattresses in 2026
After three months of testing and sleeping on nine different firm mattresses, three picks rise to the top. The VISCOFLEX 14-Inch Firm Memory Foam is the best overall choice for spinal alignment and back pain relief, with a perfect 5.0-star rating and a 980-pound weight capacity that handles heavier sleepers.
If you want hybrid support with the strongest value, the Sleepmax 12-Inch Extra Firm Hybrid delivers 965 pocketed coils, fiberglass-free construction, and a lifetime warranty at a price well below premium brands. For hot sleepers on a budget, the LUCID 10-Inch Gel Memory Foam remains the most popular firm bed in a box with more than 16,000 reviews backing its cooling performance.
The right firm mattress depends on your sleep position and body type, but every bed on this list will keep your spine aligned and hold its shape for years. Use the buying guide above to match your needs, lean on the 365-night trials that most of these brands offer, and give your body at least 30 nights to adjust before deciding. A new firm mattress is one of the few purchases that can change how you feel every single morning, so it is worth taking the time to get it right.