The Casper One is Casper’s current foam model, sold as the brand’s best seller in the foam category and positioned as an affordable three-layer mattress with a responsive, medium-firm feel. It is the entry point of the foam and hybrid lineup shown on Casper’s own page, and it carries a single feel rather than a choice of firmness levels. That combination of a lower Queen price, one clearly stated feel, and no firmness decision to make at checkout is the main reason to consider it. The trade-offs sit in the trial window, the warranty length, and the build itself, all of which are covered below.
This review is part of our guide to the best innerspring mattresses, where the strongest models are compared side by side.
Our pick
Saatva Classicthe coil alternative if The One’s single feel and 100-night trial leave you unsure
- 365-night home trial
- Free white-glove delivery and old-mattress removal
- Lifetime warranty
- Three selectable comfort levels instead of one medium-firm feel
What is the Casper One, exactly?
The Casper One is Casper’s current all-foam mattress, built from three layers of foam with no coils anywhere in the stack. The top layer is Breathe Flex Foam, described by the brand as a responsive and breathable open-cell foam. Beneath it sits Align+ Memory Foam, a conforming memory foam with continuous support. The base is the Casper Core, a sturdy high-density foam layer engineered to support you night after night and year after year. Casper lists the feel as medium-firm and responsive and lively, and The One is offered in that single feel rather than a range of firmness options.
The product page also positions The One as especially comfortable for stomach sleepers and describes ergonomic support through firmer foam under the hips, waist, and lower back, with precisely cut channels designed to help align the spine. Those are the brand’s own design descriptions. A design description tells you how the mattress is built; it does not tell you how your body will experience it, so treat the firmness label as a starting point rather than a guarantee.
Casper also shows a Cloud One at $899 and a Dream at $1,215 in the same comparison, so The One sits at the entry point of the lineup displayed on the page. The Cloud One is listed as three layers of responsive foam with a plusher feel, priced $200 above The One. The brand’s former Original product URL now redirects to The One, so a listing labeled Original may actually be showing The One’s current prices and terms. Read the model name on the page you are buying from.
Who should buy the Casper One, and who should not?
Buy the Casper One if you want a straightforward all-foam mattress at a lower Queen price, with one clearly stated medium-firm feel and no firmness decision to make at checkout. Skip it if you want a longer home trial, selectable firmness levels, an innerspring build, or in-room setup and mattress removal, since those belong to other brands rather than to The One’s listed terms.
This is the standalone summary of the choice. The Queen sale price shown on Casper’s page is $899, with a displayed regular price of $1,149, and the trial is 100 nights as Casper describes it. Those figures come from the official Casper product page for The One. If a longer trial matters more to you than the lower upfront price, compare the Saatva Classic, which lists a 365-night home trial and a lifetime warranty, before you commit to a 100-night window. The full comparison lives at saatva-vs-casper-2026.
Shoppers who already know they want foam and a single balanced feel are the natural fit. Shoppers who are unsure about firmness, who share a bed with someone who wants a different feel, or who want more than 100 nights to decide should read the rest of this page before ordering.
How is the Casper One built and what does it cost?
The build is three foam layers with no coils, and the price varies by size. The table below lists every size Casper shows for The One, with the sale price and the displayed regular price side by side.
| Size | Sale price | Displayed regular price |
|---|---|---|
| Twin | $699 | $874 |
| Twin XL | $779 | $974 |
| Full | $859 | $1,074 |
| Queen | $899 | $1,149 |
| King | $1,319 | $1,649 |
| California King | $1,319 | $1,649 |
| Split King | $1,558 | $1,948 |
The brand displays a save 20% message against the Comp. Value on the featured Twin configuration, and the page notes that 92 percent of customers keep their mattress, with an asterisk pointing to the brand’s own qualification. Treat that figure as Casper’s stated retention rate, not as an independent measurement. Casper also lists the One as Consumer Reports’ top-rated all-foam mattress of 2026, with the accompanying note that Consumer Reports does not endorse products or services.
Is the Casper One firm Cal King mattress available?
Casper lists a California King size for The One at a sale price of $1,319 against a displayed regular price of $1,649, the same figures shown for the King. The One is offered in a single medium-firm feel, so there is no separate firm version of the Cal King to choose from on this model. Shoppers who want a firmer surface in a California King size will find firmness options elsewhere in Casper’s range or in other brands, while The One keeps one balanced feel across every size it ships in.
See the Saatva Classic price in your size →
How does the Casper One feel and support sleepers?
Casper describes The One as a responsive yet supportive medium-firm feel, with three layers of cradling foam. The Breathe Flex Foam is the responsive top layer, the Align+ Memory Foam is the conforming middle layer, and the Casper Core is the sturdy high-density base. The brand also states that three layers of responsive foam give a bit of bounce so you never feel stuck, which is a claim about the design intent rather than a measured result.
On support, the product page lists ergonomic support with firmer foam under the hips, waist, and lower back, plus precisely cut channels designed to help align the spine. It also lists continuous support from the premium foam across the mattress. If you sleep on your stomach, the page calls The One especially comfortable for that position, which is worth noting because stomach sleepers usually look for a surface that keeps the hips from sinking too far.
None of this replaces lying on the mattress yourself, so use the 100-night trial as the real test. The feel label is a starting point, and a medium-firm foam mattress will read differently depending on your weight, your usual sleep position, and the base you place it on.
Does the Casper One sleep cool?
Casper’s page states that every layer of foam is designed for all-night breathability and that Breathe Flex Foam is designed to keep air moving so you stay asleep. The cover is listed as a Cozy Cover, and the page notes two temperature solutions in the broader cover range, including a cool-to-the-touch option on other configurations. Cooling matters most for people who wake up hot, and a breathability description on a product page is not the same as a measured temperature result, so read the current spec sheet carefully before you rely on it.
How does the Casper One handle motion and edge support?
What the official page does list is continuous support and an ergonomic support design with firmer foam under the hips, waist, and lower back. If motion transfer or edge support is a deciding factor for you, compare it against a model with published figures in those categories before ordering. These points matter most for couples, who share a bed and notice movement, and for anyone who sits or sleeps near the edge. A foam mattress without a published edge spec should be evaluated during the trial rather than assumed to perform a certain way.
What do the trial, warranty and delivery terms say?
Casper lists a 100-night risk-free trial and a 10-year limited warranty for The One, with free shipping and returns shown on the page. Delivery is described as free, no-contact delivery. Those are the terms as the brand states them on the current product page; the asterisks on the page point to qualifications you should read in full before you order, since trial and warranty conditions often include specific requirements. Compare those terms against what you actually need.
A 100-night trial is shorter than the 365-night home trial Saatva lists for the Saatva Classic, and a 10-year limited warranty is shorter than the lifetime warranty Saatva lists. Neither difference makes The One a bad buy; it makes the trial window a real constraint for anyone who needs longer to decide, and it makes the warranty length a real factor for anyone thinking about a decade of use.
Who should not buy the Casper One?
Skip The One if you want a selectable firmness, since Casper lists one medium-firm feel for this model. Skip it if you want an innerspring or hybrid build, because The One is all foam. Skip it if you need more than 100 nights to decide, want in-room setup and old-mattress removal, or want a warranty longer than the 10-year limited term the brand lists. Also skip it if you are trying to minimize the Queen price above all else and a lower-priced foam option with a firm feel suits you, since firmness preference and price both vary by shopper.
Do not confuse The One with Casper’s other models.
How does the Casper One compare with the Saatva Classic?
The two mattresses answer different questions. The Casper One is an all-foam mattress with a single medium-firm feel, a Queen sale price of $899 against a $1,149 regular price, a 100-night risk-free trial, and a 10-year limited warranty. The Saatva Classic is an innerspring mattress with three selectable comfort levels, a listed 365-night home trial, a lifetime warranty, and free white-glove delivery that includes in-room setup and old-mattress removal at no additional cost.
| Feature | Casper One | Saatva Classic |
|---|---|---|
| Build | All foam, three layers | Innerspring with dual-coil design |
| Feel | One medium-firm feel | Plush Soft, Luxury Firm, or Firm |
| Queen price | $899 sale, $1,149 regular | Listed from $1,904 |
| Trial | 100 nights | 365 nights |
| Warranty | 10-year limited | Lifetime |
| Delivery | Free, no-contact | White-glove with setup and removal |
The choice is between a lower upfront price with a shorter trial and a coil build with a longer trial and setup service. Shoppers who want foam, a single balanced feel, and a straightforward purchase tend to land on The One. Shoppers who want coils, a choice of firmness, or more time to decide tend to land on the Saatva Classic. The full side-by-side lives at saatva-vs-casper-2026.
Other comparisons are worth reading before you decide, including casper-vs-nectar-2026, casper-vs-dreamcloud-2026, and casper-vs-tempur-pedic-2026. If you are weighing Casper against other foam-first brands, leesa-vs-casper-2026 and tuft-and-needle-vs-casper-2026 cover that ground.
Where does The One sit in Casper’s own range?
Casper’s page shows The One at $699, Cloud One at $899, and Dream at $1,215 in the same comparison, so The One is the lowest-priced of the three models displayed. The Cloud One adds $200 over The One and is described as three layers of responsive foam with a plusher feel. The Dream sits above both. If you are shopping within Casper rather than across brands, the gap between The One and the Cloud One is the price of a plusher feel, and the gap to the Dream is a larger step into the brand’s higher tier.
For readers comparing Casper models in depth, casper-original-review-2026, casper-wave-hybrid-review-2026, casper-snow-max-review-2026, and casper-dream-max-review-2026 each cover a different model in the lineup.
Verdict
The Casper One is the right call for shoppers who want a simple all-foam mattress at a lower Queen price, one medium-firm feel, and no firmness decision to make. It is the wrong call if you need a longer trial, selectable firmness, a coil build, or in-room setup and removal. For those needs, the Saatva Classic is the alternative worth pricing out first.
World Sleep Almanac score: 7.6/10
The World Sleep Almanac score is an editorial rating built from five stated criteria, each weighed on its own terms. For the Casper One, the criteria break down as follows:
- Price at equal size: 8/10. The Queen sale price of $899 against a displayed regular price of $1,149 places The One at the entry point of the lineup Casper shows on its own page.
- Trial and returns: 7/10. The 100-night risk-free trial with free shipping and returns is a real window, though it is shorter than the 365-night home trial listed by Saatva.
- Warranty: 7/10. A 10-year limited warranty covers a decade of use, which is shorter than the lifetime warranty Saatva lists.
- Materials and construction: 8/10. Three named foam layers, a high-density base, and an ergonomic support design with firmer foam under the hips, waist, and lower back give the build a clear structure.
- Public customer reviews: 8/10. Casper states that 92 percent of customers keep their mattress, a figure the brand qualifies with an asterisk on its own page.
The score reflects the balance of a competitive price, a clearly described build, and policies that are shorter than those offered by some coil competitors. It is an editorial rating, not a test result.
Still comparing? Our Casper vs Avocado comparison is the natural next read.
Frequently asked questions
How much does the Casper One cost in a Queen size?
Casper shows a Queen sale price of $899 for The One, with a displayed regular price of $1,149. Promotions move, so confirm the current figure before you budget.
What sizes does the Casper One come in?
Casper lists Twin, Twin XL, Full, Queen, King, California King, and Split King for The One. The King and California King share the same sale price of $1,319 and the same displayed regular price of $1,649, while the Split King is listed at $1,558 against $1,948.
Is the Casper One good for stomach sleepers?
Casper’s product page calls The One especially comfortable for stomach sleepers. The mattress is listed with a medium-firm feel and ergonomic support that includes firmer foam under the hips, waist, and lower back, which is the design description the brand gives for that positioning.
Does the Casper One come with a trial period?
Casper lists a 100-night risk-free trial for The One, along with free shipping and returns. The page carries asterisks pointing to qualifications you should read in full before ordering.
How long is the warranty on the Casper One?
Casper lists a 10-year limited warranty for The One. The brand’s page notes qualifications with asterisks, so read the full terms before you order.
Is the Casper One a foam or hybrid mattress?
The One is an all-foam mattress. It uses three layers of foam: Breathe Flex Foam on top, Align+ Memory Foam in the middle, and the high-density Casper Core as the base. There are no coils in this model.
What is the difference between the Casper One and the Cloud One?
Casper lists The One at $699 and the Cloud One at $899 in the same comparison, a $200 gap. The Cloud One is described as three layers of responsive foam with a plusher feel, while The One is described as three layers of comforting foam with a responsive feel.
Does the Casper One sleep cool?
Casper states that every layer of foam is designed for all-night breathability and that Breathe Flex Foam is designed to keep air moving. The cover is listed as a Cozy Cover, and the brand notes two temperature solutions in the broader cover range, including a cool-to-the-touch option on other configurations.
Reviewed by the World Sleep Almanac editorial team. Updated 2026.