Cooler sleep is only part of a comfortable mattress. SweetNight’s CoolNest Ultra pairs a cool-touch cover, phase-change foam, breathable memory foam, gel, ventilation channels, and seven-zone support to help hot sleepers stay more comfortable without giving up the body-contouring feel they expect from foam. The 12-inch Queen starts at $729.99.
Price: $729.99-$1,029.99 (Labor Day sale; an additional 10% is automatically applied at checkout.)
Standard FedEx/GOFO shipping is included. Direct purchases include a 100-night trial and a 10-year limited warranty.
Where to buy: SweetNight CoolNest Ultra
SweetNight positions the CoolNest Ultra as the advanced option in its CoolNest Series, with upgraded cooling and support built directly into the mattress. Its pump-, app-, and subscription-free design is a useful ownership benefit, but the central story is a foam mattress made to feel cooler, less enclosed, and more supportive through the night.
Advanced cooling and support, built into the mattress
The CoolNest Ultra is SweetNight’s advanced all-foam option in the CoolNest Series, built for sleepers who want cooling and contouring in the same mattress. It comes in Queen and King with 12-, 14-, and 16-inch profiles: the 12-inch model has a Medium feel, while the 14- and 16-inch models add a thicker, Medium Plush comfort surface for people who want more cushioning.
Its five-stage cooling system is meant to work as a sequence rather than rely on a single cool-touch surface: the cover cools first contact, PCMflux foam manages heat, gel foam spreads it, AirMesh makes room for airflow, and channels help that warmth move through the stack. SweetNight says the complete system delivers up to 11° cooler sleep comfort than traditional memory foam. Under those comfort materials, the seven-layer build adds seven-zone ergonomic support, stability foam, and an anti-slip base to balance cooling with the pressure relief and support a foam mattress needs.
The seven-zone layer uses a wavy-cut pattern to change support beneath the head, shoulders, back, waist, hips, legs, and feet. The segmented construction distributes body weight, cushions pressure points, and encourages a more neutral sleeping position instead of giving every part of the body the same uniform slab of support foam.
Under that layer, high-density stability foam limits compression and helps the mattress hold its shape. Dotted fabric on the bottom reduces sliding and shifting against the foundation.
SweetNight says the foams are CertiPUR-US certified, the cover meets OEKO-TEX Standard 100, and the mattress has recognition from the American Chiropractic Association for its ergonomic design. The supplied product brief also describes the materials as skin-friendly and says the mattress meets ISPA standards. SweetNight’s broader FAQ says its current mattresses are fiberglass-free.
The cover handles first contact, then the foam takes over
SweetNight rates the Ice Silk cover at Qmax 0.25 J/(cm²·s), compared with 0.17 for standard cooling fabrics, a difference of about 47 percent. Qmax describes how quickly a fabric pulls heat from warm skin at first contact, helping explain why the surface feels cool as soon as you lie down.
The gradient cover contains more than 10,000 micropores per square centimeter, with rated breathability of up to 647 mm/s and a 20 percent airflow improvement. In practical terms, it’s designed to move both heat and moisture away from the surface instead of relying only on a slick, cool first touch.
Beneath the cover, PCMflux foam absorbs heat as its phase-change material responds within a targeted temperature range, then releases stored heat as conditions cool. SweetNight says this version contains twice as much PCM and gel and uses a hollow, large-pore structure that is three times more breathable, giving heat more room to spread and escape through the comfort layers.
The ventilated gel layer contains 30 percent gel particles and more than 700 ventilation channels. Gel absorbs and redistributes heat across a wider area, while the perforations create airflow paths through material that would otherwise be relatively dense.
AirMesh tackles another part of memory foam’s warm reputation. Its hollow-mesh structure is up to six times as breathable as traditional closed-cell memory foam while retaining contouring and pressure relief. The larger airflow system continues through microperforations in the cover, the open PCM layer, AirMesh, the perforated gel foam, and channels formed by the wave-cut support layer.
Because every cooling element is built into the mattress, the system works silently without a pump, fan, power cord, temperature controller, or ongoing subscription. The result is memory foam designed to feel less hot, sticky, and stuffy throughout the night.
How its built-in cooling approach differs from powered systems
The CoolNest Ultra is for shoppers who want a cooling-and-support upgrade from the mattress itself. Eight Sleep’s Pod uses temperature-controlled water, side-by-side adjustment, sleep tracking, and a paid Autopilot plan. BedJet 3 moves room air through the bedding with an external unit. SweetNight takes a passive approach, building its cooling materials into the sleep surface instead of adding bedside equipment, cords, hoses, or a service plan. The difference is less about declaring one approach better and more about choosing the sleep experience and ownership setup you prefer. Prices below were listed on July 27, 2026.
| Approach | How it handles heat | Published upfront price | Recurring cost | Ownership experience |
|---|---|---|---|---|
| CoolNest Ultra | Cooling fabric, phase-change foam, gel, and airflow channels | $729.99–$1,029.99 | None | Quiet, integrated cooling with no hardware or plan |
| BedJet 3 | Powered room air moves through the bedding | $498 sale price for one unit | None | Powered airflow with an external blower and hose |
| Eight Sleep Pod 5 | Temperature-controlled water circulates through a mattress cover | About $2,999 before the plan | Autopilot starts at $199 per year | Dual-zone control with a hub, app, sensors, and plan |
Pick the thickness by feel, not by the biggest number
The 12-inch model is the straightforward option if you want Medium firmness and the lowest price. SweetNight positions the 14 and 16-inch versions as Medium Plush, with more cushioning for side sleepers and anyone who prefers a deeper cradle.
| Configuration | Firmness | Published price | Likely fit |
|---|---|---|---|
| 12-inch Queen | Medium | $729.99 | Balanced foam feel for solo sleepers or couples |
| 12-inch King | Medium | $779.99 | More width without moving to the plush build |
| 14-inch Queen | Medium Plush | $799.99 | Extra cushioning for side sleepers |
| 14-inch King | Medium Plush | $879.99 | Softer surface with more room for couples |
| 16-inch Queen | Medium Plush | $929.99 | Deepest Queen comfort stack |
| 16-inch King | Medium Plush | $1,029.99 | Deepest and most cushioned King build |
Choose the profile by the feel you want. A back sleeper who likes a more level surface may prefer the Medium 12-inch model. A side sleeper who wants more cushioning around the shoulders and hips can move to the Medium Plush 14 or 16-inch build. The Ultra currently comes in Queen and King. Queen measures 60 by 80 inches, and King measures 76 by 80 inches. SweetNight says Twin and Full versions are planned, and its standard CoolNest range already provides Twin and California King alternatives.
Who SweetNight built it for
Hot sleepers and people who wake up sweaty are the obvious audience. The cover’s pores and ventilated foam stack move moisture and accumulated warmth away from the sleep surface, giving memory-foam fans a cooler, fresher, less enclosed place to settle in.
The deeper 14 and 16-inch options are aimed at pressure-sensitive side sleepers and what SweetNight calls comfort-first sleepers. The all-foam construction is designed to isolate motion, so a partner’s tossing and turning is less likely to travel across the bed. That gives couples and light sleepers a quieter alternative to a bouncier coil unit.
SweetNight also markets the Ultra to athletes and active people looking for a cooler, more pressure-relieving place to rest after training. The combination of contouring foam, zoned support, and greater airflow is designed to make recovery nights more comfortable.
Plus-size sleepers appear in SweetNight’s target audience because larger bodies can experience more heat retention and pressure concentration. The thicker comfort builds add cushioning, while the seven-zone layer spreads support across the body instead of concentrating it beneath the shoulders and hips.
Check your frame, sheets, and doorway before ordering
SweetNight says the CoolNest Ultra works with platform beds, slatted bases, box springs, and adjustable frames. You won’t need a proprietary base. Place it on a flat, sturdy foundation for stable support.
Match the sheet pocket to the profile you choose. Standard fitted sheets may fit the 12-inch version, while deep-pocket sheets give the 14 and 16-inch models more room, especially with a protector.
Move the shipping box into the bedroom before opening it. That makes setup easier and lets the mattress expand exactly where it’ll be used.
Measure the doorway and turning space before delivery so the box reaches the bedroom smoothly.
What to expect during setup
SweetNight ships its mattresses compressed in a box. Its website gives buyers a useful timeline:
- Full expansion can take up to 72 hours.
- New-product odors may fade during the same period.
- A sealed mattress can remain boxed for up to one month, though SweetNight recommends opening it sooner.Open it in a ventilated room and wait before deciding that the corners look low or the surface feels firmer than expected. Compressed foam needs time to recover its shape.
All-foam or hybrid
SweetNight positions memory foam around contouring, pressure distribution, and motion isolation. That makes the Ultra a natural match for side sleepers, couples who want less movement crossing the bed, and anyone who already knows they like the slower response of foam.
A hybrid adds coils beneath the comfort layers, bringing more bounce and more open space through the core. Shoppers who sit on the edge often, prefer a springier response, or want maximum airflow may want to compare the CoolNest Hybrid. The Ultra is aimed at people who prefer deeper foam contouring and want SweetNight’s passive cooling materials without adding coils.
Price and the bottom line
SweetNight lists six Queen and King configurations from $729.99 to $1,029.99, and standard FedEx/GOFO shipping is included. The delivery estimate appears with the selected configuration during ordering.
The CoolNest Ultra is SweetNight’s advanced CoolNest Series option for shoppers who want cooler foam without trading away contouring, pressure relief, or support. Its Ice Silk cover, PCMflux foam, gel, AirMesh, airflow channels, and seven-zone support work as one sleep surface rather than a list of disconnected features. The lack of a controller, pump, app, or subscription is a practical ownership benefit, but the stronger case is the more breathable, supportive memory-foam experience it aims to deliver.
Price: $729.99-$1,029.99 Price: $729.99-$1,029.99 (Labor Day sale; an additional 10% is automatically applied at checkout.)
Standard FedEx/GOFO shipping is included. Direct purchases include a 100-night trial and a 10-year limited warranty.
Where to buy: SweetNight CoolNest Ultra
Sources
- SweetNight CoolNest Ultra product page
- SweetNight mattress FAQ
- SweetNight return policy
- SweetNight shipping policy
- SweetNight mattress warranty policy
- SweetNight fiberglass FAQ
- SweetNight mattress expansion guidance
- US Department of Energy explanation of phase-change heat storage
- Eight Sleep Pod 5 official page
- BedJet 3 official page
