The Sweetnight Coolnest Ultra Memory Foam mattress puts cooling first, and that is the whole reason it exists. Sweetnight built an upgraded 5-stage cooling system into a memory foam mattress and backs it with a 7-zone ergonomic support layer, CertiPUR-US certified foam, and a Queen price of $729.99 against a comparison value of $919.99. If you wake up overheated and sweaty, this mattress is aimed squarely at you. If you want a long trial window or a coil-based feel, this is not the configuration to start with.
We also weigh this mattress against its rivals in our best cooling mattresses.
Our pick
Saatva Classic the longer-trial alternative if the 100-night window worries you
- 365-night home trial
- Free white-glove delivery and old-mattress removal
- Lifetime warranty
- Three comfort levels and two heights, so you match the feel to your sleep position
Who is the Sweetnight Coolnest Ultra for?
The documented buyer profile is specific. Sweetnight lists this mattress as the best solution for hot sleepers and night sweaters, athletes and active individuals, plus-size sleepers, pressure-sensitive side sleepers, comfort-first sleepers, and light sleepers or couples disturbed by movement. If you wake up overheated and sweaty, the brand built the cooling stack for you. If you want a long trial window or a coil-based feel, this is not the configuration to start with.
Three groups should look closely at the specs before buying. Hot sleepers get the full pitch, since the entire CoolNest Ultra system is the headline feature. Side sleepers get a named 7-zone ergonomic support foam with a wavy-cut design aimed at hips and shoulders. Couples get a memory foam build, which the brand positions for people easily disturbed by movement at night. The one group that should pause is anyone who reads a 100-night trial as too short to judge a foam mattress across seasons.
Two more groups appear in the brand’s own list. Athletes and active individuals are named as a fit, with the brand framing restful sleep as part of recovery. Plus-size sleepers are named as a fit, with the brand noting that they hold more heat and feel more pressure. Both groups are pointed at the same two features: the cooling stack for heat, and the 7-zone support foam for pressure. Comfort-first sleepers are named as wanting plush comfort with balanced support, which is the brand’s own phrasing for the feel it built.
What does the spec sheet actually say?
Here are the documented figures from the official product page, with no additions. The Queen price is listed at $729.99 against a $919.99 comparison value, and the page shows a saving of $190.00 with a monthly figure of as low as $60.83. Thickness options are 12 inch, described as essential cooling and support, 14 inch, described as enhanced cooling and support, and 16 inch, described as ultimate cooling and support. Sizes shown on the page are Queen and King.
| Specification | Documented figure |
|---|---|
| Listed Queen price | $729.99, comparison value $919.99 |
| Thickness options | 12 inch, 14 inch, 16 inch |
| Sizes shown | Queen, King |
| Trial | 100-night risk-free trial |
| Warranty | 10-year warranty |
| Shipping | Free U.S. shipping |
| Foam certification | CertiPUR-US |
| Fabric certification | STANDARD 100 by OEKO-TEX |
| Support system | 7-zone ergonomic support foam, wavy-cut design |
| Expansion time | 72 hours to fully expand after unboxing |
The page also lists HSA and FSA eligibility. The three thickness options carry their own cooling and support labels, and the page shows a model selector with Basic, Pro, and Ultra tiers, so confirm which tier the price belongs to before you order. The sizes shown on the product page are Queen and King, which narrows the fit for anyone shopping a Twin or Full.
How does the cooling system work, according to the brand?
Sweetnight describes an upgraded 5-stage cooling system that combines instant cooling, dynamic temperature regulation, and continuous heat dissipation. The headline claim is that the mattress feels up to 11 degrees cooler, and the gradient ice silk cover is listed with a Qmax of 0.25 for instant cooling. PCMflux foam is described as actively balancing temperature through the night, and AirMesh foam is listed at 6 times breathability for continuous heat dissipation. Read those numbers as brand statements, not as independent measurements.
The 11 degree figure and the Qmax value come from the manufacturer’s own product page, and no third-party test result appears in the documented material. What the page does document is the layer list: a gradient cooling ice silk cover, PCMflux high resilience foam, AirMesh breathable memory foam, ventilated gel memory foam, 7-zone ergonomic support foam, enhanced stability support foam, and a durable anti-slip dotted fabric base.
The gradient ice silk cover delivers instant cooling on contact. PCMflux foam handles dynamic temperature regulation across the night. AirMesh breathable memory foam, ventilated gel memory foam, and open airflow channels make up the advanced 3D airflow stage, which Sweetnight says delivers 6 times more breathability. Together the brand frames this as a 5-stage system, and the marketing language is consistent: feels up to 11 degrees cooler, instant cooling, continuous heat dissipation.
The brand also names who the cooling stack is for, and the list is worth reading before you buy. Hot sleepers and night sweaters who wake up overheated and sweaty are first. Athletes and active individuals follow, with the brand framing restful sleep as part of recovery. Plus-size sleepers are named because they hold more heat and feel more pressure. Each of these groups is pointed at the same construction: a cover that cools on contact, a foam that regulates temperature, and a foam that dissipates heat. The cooling story is the product’s identity, not a side feature.
What about feel, support, and pressure relief?
The documented support story is the 7-zone ergonomic support foam with a wavy-cut design, paired with an enhanced stability support foam layer. Sweetnight positions the mattress for pressure-sensitive side sleepers who feel pressure around hips and shoulders, and for comfort-first sleepers who want plush comfort with balanced support.
Two practical notes come straight from the page. First, the mattress needs 72 hours to fully expand after unboxing, so judge the feel after that window rather than on day one. Second, the thickness you choose changes the stack: the 12 inch profile is labeled essential cooling and support, the 14 inch is labeled enhanced, and the 16 inch is labeled ultimate.
The 7-zone ergonomic support foam has a wavy-cut design. The brand pairs it with an enhanced stability support foam below, which is the layer that keeps the surface from feeling soft all the way through. For side sleepers, the combination is aimed at the hips and shoulders, the two points that carry the most pressure in that position. For comfort-first sleepers, the brand’s own words are plush comfort with balanced support.
What the page does give you is the thickness ladder: 12 inch for essential cooling and support, 14 inch for enhanced, 16 inch for ultimate. If you are choosing between them, the labels are the brand’s own guide to how the profiles differ, and they are the only feel guidance on the page.
Is motion isolation and edge support covered?
Sweetnight lists the mattress as a best solution for light sleepers and couples easily disturbed by movement at night, which is a positioning statement rather than a test result. No durability data, sagging figure, or cycle test appears in the material either.
Buyer guidance on these gaps: on the official page, check the warranty terms for what is covered over the full 10 years, and check whether the 100-night trial has any conditions on returns. This matters most for couples, who need to know how the surface behaves when one person moves, and for anyone comparing a foam build against a coil mattress, since the two categories behave differently by construction.
What do the certifications cover?
Two certifications are documented. All foam is certified by CertiPUR-US, and the fabric passes the STANDARD 100 by OEKO-TEX. CertiPUR-US covers foam content, emissions, and durability criteria set by the foam industry program, and OEKO-TEX STANDARD 100 tests textiles for harmful substances. Both are listed on the official product page.
The page also lists compatibility notes: unbox and allow 72 hours to fully expand. Bundle options appear on the page, including a CoolNest ergonomic cooling pillow listed at $199.99 as a comparison value and a CoolNest cooling sheet set listed at $229.99 as a comparison value.
See the Saatva Classic price in your size →
What does it cost, and what are the trial terms?
The Queen is listed at $729.99 against a $919.99 comparison value, a documented saving of $190.00, with financing shown as low as $60.83 per month. The trial is a 100-night risk-free trial, shipping is free in the United States, and the warranty is 10 years. The page also shows HSA and FSA eligibility.
For context on the trial and warranty figures, the Saatva Classic page lists a 365-night home trial, free white-glove delivery with in-room setup and old mattress removal at no additional cost, and a lifetime warranty on the mattress for the original purchaser. Those are the documented figures from the official Saatva pages, and they are the clearest contrast point against the Sweetnight 100-night window and 10-year term.
Both figures are stated on the product page. Prices and promotions move, so treat the listed Queen figure as the reference point rather than a fixed number, and confirm it at the time you order.
Who should NOT buy the Sweetnight Coolnest Ultra?
Skip this mattress if a 100-night trial feels too short to judge a foam mattress across seasons. Skip it if you want a coil-based feel, since this is a memory foam build by construction. Skip it if you want white-glove delivery with old mattress removal, since the Sweetnight page lists free U.S. shipping rather than in-room setup. And skip it if you want a warranty longer than 10 years, since the Saatva Classic page lists a lifetime warranty for the original purchaser.
The trial is a 100-night risk-free trial. The 10-year warranty is a real term, and what it covers over those years is worth reading before you order. Both are shorter than the Saatva Classic’s 365-night trial and lifetime warranty, and that gap is the clearest reason to weigh the two side by side.
The construction is the second dividing line. This is a memory foam mattress with a 7-zone ergonomic support foam and an enhanced stability support foam, not a coil mattress. Sweetnight positions it for light sleepers and couples easily disturbed by movement at night, which is a foam-category argument. The mattress needs 72 hours to fully expand after unboxing.
A third group should pause: shoppers who want a numeric firmness score to compare against other mattresses. If a firmness number is how you normally narrow a shortlist, this page will not give you one.
How does it compare with the Saatva Classic?
The Saatva Classic is an innerspring mattress with a dual-coil design, a 3 inch Euro pillow top, and three comfort levels: Plush Soft at 3 out of 10, Luxury Firm at 5 to 7 out of 10, and Firm at 8 out of 10. It comes in two heights, 11.5 inch and 14.5 inch. The Saatva Classic page lists a 365-night home trial, free white-glove delivery with in-room setup and old mattress removal, and a lifetime warranty for the original purchaser. Those are the figures that separate the two mattresses most clearly.
| Point of comparison | Sweetnight Coolnest Ultra | Saatva Classic |
|---|---|---|
| Construction | Memory foam with 7-zone support | Innerspring with dual-coil design |
| Trial | 100-night risk-free trial | 365-night home trial |
| Warranty | 10-year warranty | Lifetime warranty |
| Delivery | Free U.S. shipping | Free white-glove delivery and old mattress removal |
| Firmness options | No numeric firmness published | Three comfort levels: Plush Soft, Luxury Firm, Firm |
| Heights | 12, 14, 16 inch | 11.5, 14.5 inch |
Who should buy the Sweetnight Coolnest Ultra: hot sleepers and night sweaters who want a cooling-first memory foam mattress, side sleepers who want a 7-zone support layer aimed at hips and shoulders, comfort-first sleepers who want plush comfort with balanced support, and buyers who prefer a foam build over coils. The Queen price of $729.99 against a $919.99 comparison value is the budget frame, and the 100-night trial and 10-year warranty are the terms you accept with it.
Who should buy the Saatva Classic: buyers who want a full year to decide, since the Saatva Classic page lists a 365-night home trial. Buyers who want the mattress carried in, set up, and the old one removed, since free white-glove delivery with in-room setup and old mattress removal is listed at no additional cost. Buyers who want a firmness choice, since three comfort levels and two heights are listed. Buyers who want the longest warranty term, since a lifetime warranty for the original purchaser is listed on the Saatva warranty page.
If cooling is your main problem and foam is your preferred feel, the Sweetnight Coolnest Ultra is the one built around that problem, with a 5-stage cooling system and a 7-zone support layer as the two headline construction facts. If trial length, delivery service, and firmness choice are your main priorities, the Saatva Classic is the one whose documented figures answer those points, with a 365-night home trial, free white-glove delivery with old mattress removal, three comfort levels, and a lifetime warranty.
World Sleep Almanac score: 7.6/10
- Materials and construction: 8/10. A named 7-zone ergonomic support foam with a wavy-cut design, CertiPUR-US certified foam, and fabric passing STANDARD 100 by OEKO-TEX give the build a documented, verifiable base.
- Cooling approach: 8/10. A 5-stage system with a gradient ice silk cover, PCMflux foam, and AirMesh foam is a specific, layered answer to a specific problem, even though the 11 degree figure is a brand statement.
- Trial and returns: 7/10. A 100-night risk-free trial is a real window, and it is shorter than the 365-night home trial listed for the Saatva Classic.
- Warranty: 7/10. A 10-year warranty is a standard term, set against a lifetime warranty listed for the Saatva Classic.
- Price at equal size: 8/10. The Queen at $729.99 against a $919.99 comparison value places the mattress in the mid-range for a named cooling foam build.
The score is an editorial rating based on these criteria, not a lab test.
Verdict: The Sweetnight Coolnest Ultra Memory Foam mattress is a cooling-first foam mattress with a 7-zone support layer, sold with a 100-night risk-free trial and a 10-year warranty at a Queen price of $729.99. Buy it if hot sleepers and night sweaters describe you and foam is your preferred feel. Pass on it if you want a full year to decide, a coil build, or a firmness number to compare.
Our pick
Saatva Classic the alternative with the longer trial and the firmness choice
- 365-night home trial
- Free white-glove delivery with in-room setup and old mattress removal
- Lifetime warranty for the original purchaser
- Plush Soft, Luxury Firm and Firm, in 11.5 inch and 14.5 inch heights
Still comparing? Our Sweetnight Coolnest review is the natural next read.
Frequently asked questions
How long does the Sweetnight Coolnest Ultra take to expand?
Sweetnight asks buyers to unbox the mattress and allow 72 hours for it to fully expand. Judge the feel and the cooling after that window rather than on day one, since the foam layers need time to open fully.
Which thickness should I choose?
The page lists three profiles: 12 inch labeled essential cooling and support, 14 inch labeled enhanced cooling and support, and 16 inch labeled ultimate cooling and support. The labels are the brand’s own, and they are the clearest guide on the page to how the profiles differ.
Is the 11 degree cooling claim independently tested?
The 11 degree figure and the Qmax of 0.25 come from Sweetnight’s own product page, and no third-party test result appears in the documented material. Read them as brand statements about how the cooling system is designed to behave, not as measurements taken by an outside lab.
What sizes are shown on the page?
The sizes shown on the official product page are Queen and King. The Queen price is listed at $729.99 against a $919.99 comparison value.
Does the mattress come with certifications?
Two are documented. All foam is certified by CertiPUR-US, and the fabric passes the STANDARD 100 by OEKO-TEX. CertiPUR-US covers foam content, emissions, and durability criteria set by the foam industry program, and OEKO-TEX STANDARD 100 tests textiles for harmful substances.
What is included with the purchase?
The page lists free U.S. shipping, a 100-night risk-free trial, and a 10-year warranty. HSA and FSA eligibility is also shown. Bundle options appear on the page, including a CoolNest ergonomic cooling pillow listed at $199.99 as a comparison value and a CoolNest cooling sheet set listed at $229.99 as a comparison value.
Which sleepers does the brand name as a fit?
Sweetnight names six groups on the product page: hot sleepers and night sweaters, athletes and active individuals, plus-size sleepers, pressure-sensitive side sleepers, comfort-first sleepers, and light sleepers or couples easily disturbed by movement at night. Each group is tied to a specific construction fact, either the cooling stack or the 7-zone support layer.
For more context on the brand, read our Sweetnight mattress review covering the wider lineup, or the Sweetnight Hybrid 12 inch page if you want a coil option from the same brand.
Reviewed by the World Sleep Almanac editorial team. Updated 2026.