As I’ve shared on multiple occasions, SweetNight is one of my favorite brands for bedroom products. They have decent prices and great quality for the money, and I think that’s important in today’s unstable economy. They’ve recently launched a new mattress, the CoolNest Ultra. It’s their most expensive one to date, so I was curious to see if it’s worth its price.
SweetNight CoolNest Ultra Mattress Overview
This is a premium all-foam cooling mattress whose main promises are cooling and support. It’s built around a 5-stage cooling system, a phase-change (PCM) comfort layer, and a 7-zone ergonomic support core. It could be an excellent match for hot sleepers, side sleepers, and couples who want strong motion isolation.
Quick Overview
| Best for: | Hot sleepers, side sleepers, couples, plus-size sleepers |
| Mattress type: | All-foam, cooling memory foam |
| Firmness: | 12″ = Medium · 14″/16″ = Medium Plush |
| Sizes: | Queen, King (12″, 14″, 16″ profiles) |
| Price range: | ~$730–$1,030 depending on size and thickness (frequently discounted) |
| Trial period: | 100 nights |
| Warranty: | 10 years |
| Certifications | CertiPUR-US®, OEKO-TEX® Standard 100, ACA-endorsed |
What Makes the CoolNest Ultra Different
Cooling mattresses are everywhere, but SweetNight built the CoolNest Ultra around a genuinely layered approach to heat management rather than relying on a single gel-infused layer. The mattress stacks five cooling-focused components:
- Gradient Cooling Ice Silk Cover — rated at a Qmax of 0.25 J/(cm²·s), which SweetNight states is roughly 47% higher than standard cooling fabrics, for an instant cool-to-the-touch feel the moment you lie down.
- PCMflux® High-Resilience Foam — infused with phase-change material and gel particles that absorb body heat as you warm up and release it as you cool down, smoothing out temperature swings overnight.
- AirMesh™ Breathable Memory Foam — an open, mesh-like structure that the brand says delivers up to 6x the breathability of traditional closed-cell memory foam.
- Ventilated Gel Memory Foam — gel-infused foam with 700+ perforations that continues to pull heat away from the sleep surface.
- 7-Zone Ergonomic Support Foam — a wavy-cut support core that targets the head, shoulders, back, waist, hips, legs, and feet separately, promoting spinal alignment while distributing pressure.
A high-density stability layer and an anti-slip fabric base round out the build, adding durability and keeping the mattress from sliding on the frame.
Comfort and Feel
The 12″ model has a Medium feel, while the 14″ and 16″ versions lean towards Medium Plush, giving shoppers a way to dial in firmness by thickness rather than just picking from a single flat option. That’s a smart bit of product design: side sleepers who want more cushioning around the shoulders and hips can size up to the 16″, while back and combination sleepers who prefer a firmer, more neutral platform can stick with the 12″.
Because it’s an all-foam mattress, motion isolation is a standout strength — a real plus for couples or anyone sharing their bed with a restless partner or a pet.
Cooling Performance
Cooling is the headline feature, and the layered design backs it up. The ice silk cover handles the first line of defense with an instant cool-to-touch surface and thousands of micro-pores for moisture wicking. From there, the PCM-infused foam actively regulates temperature rather than just dissipating it passively, while the AirMesh and ventilated gel layers keep air moving through the mattress instead of letting heat build up in the deeper foam layers.
Independent testing from Sleep Doctor‘s product testing team rated the CoolNest Ultra 8.4 out of 10 overall, and specifically called out its motion isolation as “among the strongest we’ve seen.” Most mattresses tend to lose their cooling ability and start filling warmer within less than one hour. The CoolNest Ultra continues to dissipate heat long after that, especially in its thinner models that provide less cushioning.
Support and Pressure Relief
The 7-zone wavy-cut support foam is designed to give firmer support under the heavier parts of the body (shoulders, hips) and softer give elsewhere, which helps maintain spinal alignment across sleep positions. In the same independent testing, pressure relief scored 9.5 out of 10, with reviewers highlighting it as especially well-suited to side sleepers. Perimeter (edge) support scored lower, which is typical for an all-foam mattress without a reinforced coil border — worth factoring in if you tend to sit or sleep near the edge of the bed.
Who It’s Best For
- Hot sleepers and night sweaters who overheat on traditional memory foam
- Side sleepers who want pressure relief at the shoulders and hips (14″ or 16″ recommended)
- Back and combination sleepers who prefer a more balanced, supportive feel (12″ recommended)
- Couples and light sleepers who are sensitive to a partner’s movement
- Plus-size sleepers who tend to sleep hotter and put more pressure on foam layers
- Athletes and active individuals who prioritize recovery-focused sleep
Who Might Want to Look Elsewhere
- Sleepers who strongly prefer the bounce and edge support of a hybrid or innerspring mattress – See SweetNight CoolNest Hybrid
- Anyone needing Twin, Twin XL, Full, or California King sizes — the Ultra currently ships only in Queen and King (SweetNight’s standard CoolNest line covers the other sizes)
Certifications and Trust
The CoolNest Ultra’s foams are CertiPUR-US® certified (free of ozone depleters, heavy metals, formaldehyde, and prohibited phthalates), and the cover fabric is OEKO-TEX® Standard 100 certified for skin-safety. The mattress also carries an American Chiropractic Association (ACA) endorsement for ergonomic spinal support.
Trial, Warranty, and Price
SweetNight backs the CoolNest Ultra with a 100-night risk-free trial and a 10-year limited warranty. Pricing runs roughly $730 to $1,030 depending on size and thickness, though the brand runs frequent sitewide promotions that bring the entry price down further. Given the layered cooling tech and 7-zone support system, it’s competitively positioned against other premium cooling mattresses in the same price bracket.
Final Verdict
The SweetNight CoolNest Ultra earns its “Ultra” name — it’s a thoughtfully engineered cooling mattress that goes well beyond a single gel layer, and it delivers where it counts most for its target sleeper: temperature regulation, pressure relief, and motion isolation. If you’re a hot sleeper or side sleeper shopping in the mid-to-premium price range, it’s a strong contender. Those who prioritize firm edge support or need a hybrid’s responsiveness may want to compare it against SweetNight’s own CoolNest Hybrid before deciding. All in all, most shoppers will have their needs met by one of SweetNight’s great mattresses.
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