Casper The One Mattress Review (2026) | Expert Tested

Our Review Process: Each mattress we review undergoes a rigorous evaluation process. We assess comfort, support, cooling, and durability through both subjective experiences and objective tests.

Criteria include pressure relief, spine alignment, mattress responsiveness, motion transfer, edge support, and temperature regulation. This comprehensive approach ensures our reviews are thorough and unbiased.

I. Mattress Layers, Materials, and Construction

When I examine a mattress, I always start by understanding what’s inside. Casper’s The One uses a four-layer all-foam construction that prioritizes simplicity and consistent comfort. I spent time learning about each component and how they work together.

Starting from the base, the foundation begins with the Casper Core, a high-density polyfoam base that provides essential durability and support, ensuring the mattress retains its shape over time.

When I pressed on different areas, I could feel the solid, supportive base underneath the softer comfort layers. This layer doesn’t provide contouring or pressure relief—that’s not its job. Instead, it creates a stable platform that allows the upper layers to perform without compromising support.

Above the base sits the Align memory foam layer, which is where most of the contouring feel comes from. When I lay on the mattress, I could feel this layer molding around my hip and shoulder contact zones. It adjusted as I changed positions, with the slow-release character typical of viscoelastic foam. This is the layer that creates the “hug” sensation side sleepers often describe on all-foam mattresses.

Next is the Breathe Flex foam layer. When I pressed into this layer, it compressed smoothly and bounced back more quickly than the Align layer above it. This is the layer that makes The One feel more responsive than a standard all-foam mattress, though it does not match the instant bounce of a hybrid or latex construction. The open-cell design also contributed to the 8/10 cooling result by allowing more airflow through the core than dense closed-cell foam would.

When I pressed into this layer with my hands, it compressed smoothly and bounced back relatively quickly for a foam material.

And finally, the mattress is topped with the Cozy Cover, a soft knit fabric that enhances breathability and comfort. The cover also features ventilated holes designed to promote airflow through the surface. The cover feels pleasant to the touch and fits snugly over the foam core without bunching or excess material.

Casper also offers the Cloud One as a step-up foam model at $200 more. It shares the same four-layer structure and Cozy Cover but introduces patent-pending Casper Core+™ technology—foam pillars built into the core that create pockets of relief and deliver a noticeably plusher feel.

The Cloud One is rated medium-soft compared to The One’s medium-firm, and Casper specs it with continuous support plus edge support, whereas The One offers continuous support alone.

For sleepers who want the same Casper engineering with more give and a more defined edge, the Cloud One is worth the upgrade consideration. I tested The One, so my scores and assessments throughout this review reflect that model—but I’ll note where the Cloud One’s differences are relevant.

During my examination, the stitching appeared solid and consistent throughout. The layers felt well-bonded together with no gaps or separation. The construction quality looks solid for a mid-range all-foam mattress, and the materials feel substantial rather than cheap or flimsy.

The 11-inch height feels moderate compared to today’s mattresses, which often measure 12–16 inches. This lower profile creates easier bed access and a more traditional mattress aesthetic. In testing, I found these trade-offs to be exactly what the scores reflect: a 10/10 for motion isolation and 8/10 for cooling are strong results for all-foam, while the 7/10 edge support and 7/10 responsiveness are the predictable limitations of the construction. These are not flaws specific to The One; they are the known behavior of dense all-foam mattresses at any price point.

The foam layers are CertiPUR-US certified, meaning they’re tested for harmful chemicals and meet standards for emissions, durability, and material safety. The mattress is also fiberglass-free and designed and assembled in the USA, which suggests careful quality control rather than mass production shortcuts.

II. Sleeping Positions

Your preferred sleep position determines how much pressure your body places on different mattress areas and what type of support you need most. I tested The One extensively across all major sleep positions to evaluate how its medium-firm feel and all-foam construction perform for different body alignments and pressure distribution patterns.

The One is described as medium-firm. I found it to be comfortable across all sleeping positions. I would not consider this mattress soft or plush, but it isn’t overly firm either—it strikes a genuine middle ground.

That said, it’s worth noting that firmness is always perceived relative to body weight. Lighter sleepers will find The One reads slightly firmer than the medium-firm designation suggests, since they compress the foam layers less. Heavier sleepers will experience more sinkage and may find it feels closer to a true medium.

Casper also redesigned this mattress significantly in 2024, and returning customers familiar with the older Casper Original should know The One skews noticeably firmer than that model—it’s a meaningful change, not a superficial refresh.

Good = well-suited

Fair = may work with caveats

Not Recommended = consider alternatives

Side Sleeping

Side sleepers need pressure relief at the hips and shoulders while maintaining spinal alignment. As a side sleeper myself, I paid particular attention to The One’s performance in this position.

When I lay on my side, the Align memory foam layer contoured around my hip and shoulder effectively. I noticed no unwanted pressure on my hips. My spine maintained a relatively neutral position, and the contouring foam helped fill the gap at my waist.

I spent several nights sleeping primarily on my side and woke up without the hip or shoulder soreness that firmer mattresses sometimes create. I would consider The One soft enough for a side sleeper, especially one who doesn’t want a super soft mattress. I personally sleep on my side and slept great when I tested this mattress.

Side sleepers who find the medium-firm feel of The One just a touch too firm should take a serious look at the Cloud One.

Its medium-soft rating and Core+™ foam pillars are designed to create additional give at pressure points, which could make a meaningful difference for sleepers who carry more weight in their hips and shoulders or simply prefer a more cradling feel.

Back Sleeping

Back sleepers require consistent support across the entire spine while allowing slight contouring for natural spinal curves.

The One performed well in this position. The memory foam layer provided enough contouring to fill the lumbar gap while the firm Casper Core base prevented my midsection from sagging.

The medium-firm feel worked well—supportive enough to maintain proper alignment but soft enough to feel comfortable rather than rigid.

It’s possible that back sleepers may prefer a firmer mattress, but in my opinion, The One is plenty firm enough for this position. I didn’t experience lower back discomfort during my testing.

Stomach Sleeping

Stomach sleepers face unique challenges because they need firm, consistent support to prevent their midsection from sinking and creating back strain. The One’s medium-firm feel approaches the edge of what works well for stomach sleeping. When I tested this position, I experienced some sinking in my hip area, though it wasn’t excessive enough to create uncomfortable back arching.

Dedicated stomach sleepers who need very firm, non-conforming support would likely prefer a firmer alternative. The One works adequately for occasional stomach sleeping but isn’t optimized for this position the way it is for side and back sleeping.

Combination Sleeping

This would be an excellent mattress for combination sleepers who may shift sleeping positions throughout the night. The medium-firm feel provided adequate support across different positions without being perfectly optimized for any single one.

However, very active sleepers should keep in mind the response time consideration I’ll discuss in the next section.

III. Mattress Responsiveness

Responsiveness determines how easily you can move around and change positions during sleep. A mattress that’s too slow to respond can make you feel trapped or require extra effort to roll over. This is particularly important for combination sleepers who switch positions throughout the night.

I used 10-pound weights to measure the mattress’s recovery speed. I dropped them onto the surface from a consistent height, then observed how quickly they bounced back.

The weights bounced back pretty nicely. One thing I want to note from when I tested the mattress is that there’s an ever so slight lag to the response time.

The mattress cradles you really nicely, but if you go to change positions, it takes just a little bit of time for the mattress to respond and settle you into that new position. This is characteristic of memory foam construction and not a flaw specific to The One—it’s simply the nature of viscoelastic foam.

For that reason, I’m giving the response time a 7 out of 10. This represents solid performance for the category, though combination sleepers or those who toss and turn frequently should keep that slight lag in mind.

It’s worth putting this score in context. While I noticed a slight lag in my personal testing—particularly when transitioning between positions—I’ve seen that other reviewers have rated The One’s response time more favorably, with some placing it among the faster-responding all-foam mattresses on the market.

The Breathe Flex foam layer does add meaningful responsiveness compared to traditional dense memory foam, and many sleepers won’t perceive the lag I noticed as a meaningful issue.

If you’re coming from a classic slow-response memory foam mattress, The One will likely feel noticeably more responsive by comparison.

My 7/10 reflects my own testing experience, but sleepers who aren’t highly sensitive to response time may find this performs better than that score implies. It simply won’t match the instant bounce of a hybrid or latex mattress.

IV. Mattress Motion Isolation

Motion isolation can make or break a shared sleeping experience. When your partner shifts during the night, you shouldn’t be bounced awake. All-foam mattresses typically excel here because foam absorbs energy locally rather than transferring it across the surface.

I used a mason jar filled with water on one side of the mattress and deliberately moved around on the opposite side—rolling over, sitting up, and shifting positions to simulate normal sleep movements.

The mason jar did not move. I can confirm from my sleep testing as well that I did not feel any movement from the other side of the mattress. The dense memory foam absorbs movement and prevents it from traveling across the bed.

I would give The One a 10 out of 10 on motion transfer. The memory foam density is the key reason the score is what it is. In my testing, it absorbed and contained movement rather than transmitting it, which is exactly the behavior I measure for in the mason jar test and partner testing. For couples who list motion isolation as their top priority, this is the result I would point to.

V. Mattress Edge Support

Mattress edge support matters for sitting on the edge to put on shoes, sleeping near the perimeter, and maximizing usable sleep surface for couples. It can also be important for those who need assistance moving in and out of bed.

Finding reliable edge support is a particular challenge with all-foam mattresses because they lack the structural reinforcement that coil systems provide.

I sat on the very edge of the mattress with my full weight and also tested lying near the edge in a normal sleeping position.

As I’m sitting on the edge, you can probably see that the edge is dipping quite a bit. There’s no reinforcement along the edge of the mattress, and without coils, that’s expected. I don’t feel like I’m going to fall off the mattress, but it does dip significantly when seated.

It’s worth distinguishing between seated and lying edge support, because the two tell different stories on this mattress.

When lying near the perimeter in a normal sleeping position, the edge holds up considerably better—my weight distributed over a larger surface area, and I didn’t feel at risk of rolling off. The more significant compression happens under concentrated seated pressure, which is typical of all-foam construction.

For sleeping purposes, the edge performs reasonably well. For sitting activities—putting on shoes, reading in bed, or spending extended time on the perimeter—the compression is more noticeable. Keep that distinction in mind when evaluating whether edge support matters for your use case.

I would give The One a 7 out of 10 on edge support. This is typical for all-foam construction. It’s adequate for sleeping near the perimeter but weaker when it comes to sitting support.

If strong edge support is a top priority, a hybrid mattress would better serve your needs—but for most sleeping purposes, The One holds up fine.

VI. Cooling and Breathability

Sleep temperature can determine whether you wake up refreshed or drenched in sweat. All-foam mattresses face inherent cooling challenges because foam retains body heat more than coil-based designs.

The One uses two notable approaches to manage temperature. First, the Cozy Cover features ventilated holes designed to promote airflow through the surface. Second, the Breathe Flex foam layer directly underneath the cover uses an open-cell design specifically constructed to help with airflow, cooling, and breathability.

This mattress is cool to the touch. The ventilated cover and open-cell foam layer work together in a way that’s meaningfully better than a standard memory foam mattress without these features. The cover allows heat to escape at the surface while the Breathe Flex foam prevents the thermal buildup that dense, closed-cell foams can create.

During my sleep testing, I didn’t overheat. I should note that I’m not typically a severe hot sleeper, so those with significant temperature sensitivity may want to set expectations accordingly. The One doesn’t offer the active cooling technology found in hybrid designs, but for an all-foam mattress, it manages breathability well.

I would give The One an 8 out of 10 on cooling and breathability. This score reflects solid performance within the all-foam category. It’s adequate for most sleepers in climate-controlled rooms but may not fully satisfy severe hot sleepers.

VII. Durability and Longevity

A durable mattress matters because it’s a significant investment you’ll use every night for years. The One’s construction and warranty coverage deserve examination to understand long-term value.

This mattress is made in the USA, it comes with a 10-year warranty, it is made with high-quality materials, and it has high-quality construction—and it looks great. Domestic manufacturing typically indicates better quality control and more consistent construction standards.

When I examined the mattress, the foam layers felt dense and substantial. The bonding between layers seemed secure with no gaps or separation. The stitching on the cover showed consistent quality. I don’t have any concerns over the durability or longevity of this mattress.

The CertiPUR-US certified foams meet standards for durability alongside safety and emissions. The high-density Casper Core base layer provides crucial structural support that prevents premature sagging.

Based on construction quality and warranty coverage, I’d expect The One to provide good performance for 6–8 years with gradual softening afterward—consistent with expectations for quality all-foam mattresses in this price range.

VIII. Potential Drawbacks

No mattress works for everyone, and The One has some limitations worth knowing before you buy.

Firmness options

This mattress only comes in one firmness: medium-firm. If you’re looking for something softer or extra-firm, it won’t meet that need. The Cloud One’s medium-soft feel is worth considering if you want to stay in the Casper family but need more give.

Weight limitations

The One performs best for sleepers between 130 and 230 pounds. Lighter sleepers will find it reads slightly firmer than labeled; heavier sleepers over 230 pounds may experience too much sinkage for adequate spinal support, particularly in back and stomach positions.

A hybrid with coil support will serve that weight range better.

Stomach sleeping

Even within the average weight range, dedicated stomach sleepers may find the medium-firm feel allows enough hip sinkage to pull the lower back out of neutral alignment. It works for occasional stomach sleeping, but it isn’t optimized for this position.

Height

At 11 inches, The One sits lower than many modern mattresses. If you prefer a taller profile or are transitioning from a thicker bed, this may feel noticeably different.

Off-gassing

I noticed a smell after unboxing that dissipated within an hour or so, but some buyers have reported it lasting considerably longer—up to two weeks in some cases. Sensitive sleepers should plan to air the mattress out thoroughly before use.

Construction type

If you’re looking for an innerspring or hybrid mattress, you would skip this one. The all-foam design also means no natural latex and no organic or natural materials throughout.

Response time

There is an ever so slight lag to the response time that combination sleepers and those who toss and turn should keep in mind.

Edge support

The edge dips significantly under seated weight, which is typical for all-foam construction but worth noting if you sit on the bed edge frequently.

Adjustable base compatibility

The One works on adjustable bases, but all-foam construction means the mattress foot can lift slightly off the frame when the base is adjusted without a sleeper’s weight holding it down. It functions normally once you’re lying on it, but it’s worth knowing if a seamless adjustable base experience is a priority for you.

IX. Trial Period, Warranty, Pricing, and Sizes

Before you click buy, here’s what you need to know.

This mattress comes with a 100-night sleep trial, a 10-year limited warranty, and it comes in all of your standard sizes: twin, twin XL, full, queen, king, and California king.

When compared to other all-foam mattress options, The One comes in at a competitive price point. It’s priced at a higher price point than the Leesa Original mattress, but at a lower price point than the Amerisleep AS3.

The Cloud One follows the same trial and warranty structure—100 nights and a 10-year limited warranty—but carries a higher price point at $200 more than The One across all sizes. Both models are available in twin, twin XL, full, queen, king, and California king.

If you’re deciding between the two at checkout, the Cloud One’s added cost buys you the Core+™ plushness upgrade and the improved edge support; The One is the stronger value pick for sleepers who prefer a firmer, more responsive feel.

Make sure to check Casper’s site for their current pricing, as promotional discounts are frequently available.

X. Customer Reviews

When I’m reviewing a mattress, I always look at customer feedback. Real users sleep on these mattresses night after night and know what works and what doesn’t. Lab tests are helpful, but nothing beats hearing from people who actually use the product in their own homes.

The One has accumulated over 17,000 customer reviews with a 4.4-star rating—a substantial volume that provides strong real-world data across diverse sleeper types.

The Cloud One, Casper’s plusher step-up model featuring the patent-pending Casper Core+™ technology, carries a 4.3-star rating across 122 reviews, with 84 of those being five stars.

Beyond the official review pages, I also looked at broader community feedback to get a more unfiltered picture.

Comfort and Support

Comfort feedback is consistently strong across both models. Customers consistently praise the balanced medium-firm feel, with one describing it as “firm and body forming” while still feeling comfortable.

That phrasing captures something I noticed during testing too—The One has enough give to feel welcoming without losing its supportive character. Cloud One buyer Elizabeth H. wrote that she loves her new mattress and no longer experiences back pain.

Eric G. called it the “best money I have ever spent on anything,” adding that he’s sleeping through the night again—an outcome that tracks directly with what I found during motion isolation testing.

Among The One reviewers, customers describe getting “a good night’s sleep with no aches or pains” and sleeping “like a baby.” One reviewer noted the mattress is “sturdy and comfortable” after several months of use, which aligns with my durability assessment.

For shoppers deciding between the two foam models, Cloud One buyer Karin F. offered a useful real-world comparison, describing it as a “nice improvement to the Cloud with the edge and slightly softer.”

That edge support improvement is something Casper explicitly touts for the Cloud One, and it’s worth factoring in if you sit on the edge of your bed frequently.

Durability and Long-Term Satisfaction

Repeat purchase behavior stands out in The One’s review pool. One customer shared they now have “this comfort in every room” after buying a second mattress. Deidre R. purchased a second for a guest room and reported that “the first purchase is just as comfortable as when it was new.”

On Reddit, one user reported going ten years on their Casper by rotating it at least once a year with no indentation issues—though they noted they don’t sleep in the same spot every night, which likely helps.

That said, several users noted memory foam eventually compresses and softens, typically within six to eight years, and one commenter pointed out that modern mattresses aren’t designed to be flipped, which limits how evenly wear distributes over time.

This is consistent with my own durability estimate of six to eight years for quality all-foam construction. The 10-year warranty provides meaningful protection within that window, but buyers should go in with realistic expectations about lifespan.

Setup and Delivery

Setup feedback is broadly positive across both models. Customers describe unboxing as straightforward, with one noting the mattress was “usable within a couple hours for a good night’s sleep.”

One reviewer mentioned it took over two weeks to fully off-gas—longer than my experience—though they confirmed it has been “great, super comfortable and supportive” since. I’d echo the recommendation to keep a window open after unboxing.

Cooling

Temperature feedback runs in line with what you’d expect for an all-foam mattress. Most customers sleeping in climate-controlled rooms report comfortable temperatures throughout the night, while those who run warm note the limitations of the foam construction.

This is consistent with my 8/10 cooling score—adequate for most sleepers, but not a replacement for a hybrid’s natural ventilation or active cooling technology.

Where Feedback Gets Mixed

The One’s rating distribution shows some lower scores—734 two-star and 963 one-star reviews out of over 17,000 total. The most common friction points touch on firmness expectations and off-gassing duration.

A handful of Reddit commenters also flagged that heavier sleepers may experience faster wear, which is worth considering given that foam density and body weight interact directly with how long comfort layers hold up.

At the same time, the user who reported still loving their mattress at 235 pounds after ten years suggests that proper maintenance and sleep habits can meaningfully extend the lifespan.

The Cloud One’s smaller review pool makes broad conclusions harder to draw, but its distribution skews strongly positive at this stage.

Overall, the customer feedback aligns closely with my testing results. The One delivers consistent comfort, strong motion isolation, and durability that holds up well with proper care—and the Cloud One offers a softer, better-edged alternative for sleepers who want the same Casper engineering with a plusher feel.

XI. Environmental Impact

Casper demonstrates meaningful environmental commitment through their manufacturing approach. The One is designed and assembled in the USA, which reduces transportation emissions compared to imported alternatives and typically means higher environmental standards during production.

The foam layers are CertiPUR-US certified, ensuring the materials are free from harmful chemicals and contribute to better indoor air quality.

Casper also focuses on responsible sourcing, utilizes recyclable materials in their products and packaging, and supports carbon offset initiatives to minimize their overall environmental footprint.

The mattress is fiberglass-free, which eliminates a material that poses disposal and potential health concerns. As with all polyurethane foam mattresses, end-of-life disposal presents challenges since foam materials don’t biodegrade quickly, and local recycling programs for foam remain limited in most areas.

Using a mattress protector and following proper maintenance to extend the mattress’s useful life is the most practical way to reduce its environmental footprint over time.

XII. Maintenance and Care

Proper care extends your mattress lifespan and maintains its performance. Casper recommends using a mattress protector to shield your mattress from spills and stains.

They also recommend occasionally vacuuming your mattress, and any cleaning should be spot clean only—never saturate the mattress, as foam takes a very long time to dry internally and can develop mold or mildew if moisture becomes trapped.

Rotate your mattress about every six months, but never flip it upside down. The Cozy Cover should always be facing up—the layers are engineered to work in a specific order from bottom to top.

Regularly cleaning your sheets and bedding will go a long way toward helping your Casper mattress last for years to come. Ensure your bed frame provides proper support, with slats no more than 3 inches apart or a solid platform foundation.

XIII. Final Verdict

Thanks for joining me on my comprehensive review of Casper’s The One mattress. Overall, I would give this mattress an 8 out of 10.

I especially appreciated the superior motion isolation of this mattress—the perfect 10/10 score reflects real-world performance that couples will genuinely appreciate night after night. The medium-firm feel worked well across all sleeping positions during my testing, and as a side sleeper, I slept great on this mattress.

The construction quality is solid, the CertiPUR-US certified foams feel substantial, and the USA manufacturing suggests reliable quality control. The Breathe Flex foam layer and ventilated cover make a meaningful difference for an all-foam mattress in terms of temperature management, earning a respectable 8/10 for cooling.

The limitations are real but expected for this construction type: a slight response time lag, edge support that compresses significantly under seated weight, and no firmness customization. Hot sleepers and those who prioritize edge support or instant responsiveness would be better served by a hybrid design.

The One delivers exactly what it promises—comfortable, well-engineered all-foam sleep at a competitive price point, backed by a 10-year warranty and a 100-night trial that removes most of the purchase risk.

I hope this review provided you with valuable insight so that you can make an informed decision when choosing your mattress. And remember, an investment in your sleep is an investment in your overall well-being.

Final Tally

XIV. FAQs

What firmness level is the Casper The One?

The One comes in one firmness option: medium-firm. I found it to be genuinely middle-ground—not soft or plush, but not overly firm either. If you need a very soft or very firm mattress, this one won’t work for you since there’s no customization available.

How tall is the mattress and will it fit my bed frame?

The One is 11 inches tall, which is shorter than many modern mattresses. This height works with most standard bed frames and platform beds and makes getting in and out of bed easier than taller alternatives. Regular fitted sheets should work fine.

Is the Casper The One good for hot sleepers?

I gave The One an 8 out of 10 for cooling. The ventilated cover and open-cell Breathe Flex foam layer make a real difference for an all-foam mattress. I didn’t overheat during my testing in a climate-controlled room.

That said, foam inherently retains more heat than hybrid designs with coil ventilation, so severe hot sleepers may want to consider a hybrid alternative.

How does motion isolation work for couples?

The One scored a perfect 10 out of 10 for motion isolation—the best score I can give. The dense memory foam completely absorbs movement on one side of the bed without transferring it to the other.

The mason jar didn’t move during my test, and during actual sleep testing I felt nothing from the other side. This is one of The One’s strongest features.

Does the Casper The One contain fiberglass?

No, The One is fiberglass-free. Casper uses alternative fire barrier materials that are safer and won’t pose the contamination risks associated with fiberglass if the cover becomes damaged.

What are the main drawbacks of this mattress?

The One only comes in one medium-firm feel, so you can’t customize the firmness. It’s 11 inches tall, which is lower than many modern mattresses. There’s a slight lag to the response time that combination sleepers should factor in.

Edge support compresses significantly when seated. And it’s all foam—no coils, no natural materials like latex.

What’s included with the warranty?

The One comes with a 10-year limited warranty covering manufacturing defects, foam breakdown beyond normal wear, and structural sagging beyond specified thresholds. It doesn’t cover normal softening over time or damage from misuse.

How long does setup take?

The mattress expands quickly once you remove it from the box and cut the plastic, reaching full height within an hour or so and ready for immediate use. I noticed an off-gassing smell after opening, so I recommend opening a window for about an hour. The box is heavy—get someone to help you move it.

Can I use the Casper The One on an adjustable base?

The all-foam construction is flexible enough to work on adjustable bases. Just confirm your base can support the mattress weight plus sleepers, and that slat spacing meets the recommended guidelines.

Do I need to rotate or flip this mattress?

Never flip The One upside down—the Cozy Cover should always face up. Rotating the mattress 180 degrees from head to foot about every six months is a good practice to prevent uneven wear patterns from developing.

What sizes are available?

The One comes in all standard sizes: twin, twin XL, full, queen, king, and California king. All sizes are 11 inches tall. Check Casper’s website for exact dimensions if you need to confirm a size will fit your space.

What maintenance does the mattress require?

Use a mattress protector to guard against spills and stains. Vacuum the mattress occasionally and spot clean with a damp cloth and mild detergent as needed—never saturate the foam.

Rotate head to foot every six months. Never flip it upside down. Wash your sheets regularly to keep the sleep surface clean and extend the mattress’s useful life.

Should I get The One or the Cloud One?

It comes down to firmness preference and budget. The One is medium-firm and suits back, stomach, and combination sleepers who want responsive, supportive foam.

The Cloud One costs $200 more and adds Casper’s Core+™ technology for a medium-soft, plusher feel with better edge support—making it the better pick for side sleepers or anyone who finds medium-firm too firm.

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