SweetNight CoolNest Ultra Memory Foam Mattress 10 Points Review

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The CoolNest® Ultra is SweetNight’s flagship cooling mattress, sitting above the brand’s entry CoolNest® and CoolNest® Pro models. It leans hard into temperature regulation, stacking five cooling-related layers on top of a 7-zone support core. Here’s a 10-point breakdown of what it offers and what to weigh before buying this unit.

1. Overview & First Impressions

The CoolNest® Ultra is positioned as SweetNight’s “premium choice” for restorative sleep, built specifically around one job: keeping hot sleepers cool without sacrificing the pressure relief of memory foam. It’s sold as an all-foam mattress (a Hybrid version exists as a separate model) in three thickness options — 12″, 14″, and 16″ — with the 14″ being the brand’s most-chosen configuration. The tagline says it plainly: “Sleep Cooler. Rest Better.” Everything about the construction supports cooling and comfort.

2. CoolNest Ultra Construction & Materials

This is a seven-layer build, more layers than most direct-to-consumer foam mattresses, especially in this price bracket:

1. Gradient Cooling Ice Silk Cover – Cool-to-touch fabric
2. PCMflux® High-Resilience Foam – Phase-Change Material (PCM) infused foam to absorb and release heat
3. AirMesh™ Breathable Memory Foam – Open-cell, hollow-mesh structure foam for superior airflow
4. Ventilated Cooling Gel Memory Foam – Gel-infused foam with 700+ perforations for improved ventilation
5. 7-Zone Ergonomic Support Foam – Wavy-cut contoured support layer
6. Enhanced Stability Support Foam – High-density base foam
7. Durable Anti-Slip Dotted Fabric Base – Non-slip bottom layer

That’s a genuinely layered cooling stack rather than a single gel-swirl top layer, which is typically the differentiator between budget cooling mattresses and more serious ones. And support is not negligible either.

3. Firmness & Feel

Firmness varies by thickness: the 12″ model is rated Medium, while the 14″ and 16″ models are rated Medium Plush. That’s a useful distinction — thinner buyers or those wanting firmer support should lean toward the 12″. Side sleepers or anyone wanting more hug and cushion should look at the 14″ or 16″. As an all-foam mattress, expect the classic memory-foam sensation: contouring, slow-recovery cradling, and minimal bounce, rather than the more responsive push-back of a hybrid.

4. Cooling Performance

This is what the mattress is designed to provide: excellent cooling. SweetNight backs it with more specificity than most brands bother with:

• Up to 11°F cooler sleep surface from the combined 5-stage system
• Cover fabric rated at Qmax 0.25 J/(cm²·s), roughly 47% higher than a standard cooling fabric (0.17), with over 10,000 micro-pores per cm²
• AirMesh™ foam, providing up to 6x greater breathability than closed-cell memory foam
• PCM particles (2x more than the standard CoolNest line) actively absorb and release heat rather than just deflecting it
• 700+ ventilation channels in the gel layer

Leaving technicalities aside, Qmax is a legitimate textile industry metric for instant “cool-touch” feel. Ice silk fabric does feel cool. The CoolNest Classic mattress received great cooling scores from third-party reviewers, and the CoolNest Pro and CoolNest Ultra are designed to provide even better performance. All these suggest that shoppers looking for cooler sleep won’t be disappointed with this mattress model.

5. Pressure Relief & Back Support

The support core uses a 7-zone, wavy-cut foam design – more zones than the base CoolNest (5-zone) and CoolNest Pro models – intended to give firmer support under the shoulders and softer give at the hips, following the body’s natural curve for spinal alignment. The mattress carries an American Chiropractic Association (ACA) endorsement, which SweetNight applies across its CoolNest line. Combined with the Medium/Medium Plush feel, this build looks best suited to side and back sleepers who want cushioning without sinking too deep; firm-support stomach sleepers may find the Medium Plush versions (14″/16″) a bit soft.

6. Motion Isolation (For Couples)

As an all-foam mattress, motion isolation is a structural strength here — foam absorbs movement rather than transferring it across the surface, which is the main reason SweetNight markets this model to “light sleepers & couples easily disturbed by movement at night.” There’s no coil layer to transmit bounce, so a partner getting in or out of bed will not create the ripple effect you’d feel on an innerspring or lower-end hybrid.

7. Durability & Build Quality

The base is a high-density Enhanced Stability Support Foam layer, which SweetNight says is designed to resist sagging and compression over time, plus a non-slip dotted fabric bottom to keep the mattress from shifting on the frame. The 10-year warranty is a solid signal of confidence, considering that specialists recommend replacing your mattress every 7-8 years.

8. Certifications & Materials Safety

This is one of the stronger parts of the listing:

• CertiPUR-US® certified foam — tested for harmful chemicals, heavy metals, and ozone depleters
• OEKO-TEX® STANDARD 100 certified cover fabric — tested for skin-safe substances
• Fiberglass-free construction
• ISPA (International Sleep Products Association) member
• American Chiropractic Association-endorsed

For anyone concerned about off-gassing or chemical sensitivities, these third-party certifications matter. They’re independently tested and confirmed.

9. Trial, Warranty & Shipping

• 100-night risk-free trial (SweetNight recommends at least 30 nights for your body to adjust before judging it)
• 10-year warranty
• Free U.S. shipping, compressed and boxed, arriving in 1–2 business days from order
• SweetNight recommends letting the mattress rest 72 hours after unboxing before use, longer than the 24–48 hours some competitors suggest
• Financing available (as low as 0% APR), plus FSA/HSA eligibility

These are solidly in line with industry norms for direct-to-consumer foam mattresses.

10. Value for Money / Who It’s Best For

At $729.99–$1,029.99 depending on thickness and size, the CoolNest® Ultra sits in the mid-tier of the DTC mattress market — meaningfully above SweetNight’s own entry CoolNest ($399.99) and Pro ($529.99) models, but well below premium cooling mattresses from legacy brands that often run $2,000+ for comparable PCM and gel-infused technology.

The mattress is best for:

• Hot sleepers and night sweaters who’ve found standard memory foam traps heat
• Side and back sleepers wanting a Medium/Medium Plush feel with targeted pressure relief
• Couples who prioritize motion isolation over bounce
• Buyers who want documented certifications (CertiPUR-US®, OEKO-TEX®) and a long trial/warranty window

It may not be ideal for stomach sleepers or anyone wanting firmer, more responsive, hybrid support (the CoolNest hybrid model should suit better).

All in all, most sleepers, especially sweaters, should be happy with the CoolNest Ultra All-Foam Mattress. It has amazing features, a solid and thoughtful construction, and the unbeatable price that helped SweetNight grow and earn its raving customer reviews. The brand shows one more time that great sleep doesn’t have to cost an arm and a leg.

Click Here to Learn More and Shop SweetNight CoolNest Ultra Mattresses!

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