Heim Nest’s lineup centers on cooling-leaning, medium-firm, all-foam mattresses built for a steady, supportive feel with low motion transfer. In our real sleep testing, the 10-inch model felt a little more forgiving up top, while the 12-inch felt firmer and more stable. Both make sense for budget shoppers who want classic memory-foam contouring, but they’re not great if you rely on strong edges or prefer a bouncy, quick-responding surface.
Table of Contents
- What’s in the Heim Nest lineup right now?
- What stood out in our testing?
- How do the 10-inch and 12-inch compare?
- How we tested Heim Nest mattresses
- Heim Nest Mattress: our testing experience
- How the scores compare
- Which Heim Nest model fits your sleep style?
- What to know before you buy
- How Heim Nest compares with common alternatives
- How to get the best feel out of a Heim Nest mattress
- FAQs
What’s in the Heim Nest lineup right now?
The lineup is simple: two cooling all-foam models that differ in height and how “held up” they feel.
| Mattress | Overall Score | Pros | Cons | Ideal For | Price |
|---|---|---|---|---|---|
| Heim Nest 10" Cooling Memory Foam Mattress | 3.8/5.0 | Very good motion isolation, comfortable pressure relief, cool-to-touch cover at first contact | Edges feel soft, slower “memory foam” response, foam can warm up after hours | Lightweight-to-average sleepers, guest rooms, side/back mix | From $299.99 |
| Heim Nest 12" Cooling Memory Foam Mattress | 3.9/5.0 | Steadier support than the 10", excellent motion isolation, firmer alignment feel | Can feel firm at shoulders for lighter side sleepers, edges still foam-like, slower response | Average-to-heavier sleepers, back sleepers, couples who want steadier foam | From $469.99 |
What stood out in our testing?
In our nightly checks, the 10-inch came across as the gentler option. It let Mia’s shoulders sink with less joint pressure, but Marcus felt his hips settle deeper by morning. The 12-inch kept Marcus and my lower back steadier through longer stretches on our backs and stomachs, and Carlos liked that it resisted that mid-back “dip” some softer foams can develop. Both mattresses stayed impressively quiet when a partner changed positions, but neither had the crisp edge stability you get from a reinforced coil perimeter.
How do the 10-inch and 12-inch compare?
| Comparison item | Heim Nest 10" Cooling Memory Foam Mattress | Heim Nest 12" Cooling Memory Foam Mattress |
|---|---|---|
| Type | Memory foam (all-foam) | Memory foam (all-foam) |
| Thickness | 10 in | 12 in |
| Firmness (brand rating) | 6–7/10 (medium firm) | 7–8/10 (medium firm, firmer end) |
| Mattress top | Tight top | Tight top |
| Cover material | 23% Ice-Silk, 77% Polyester | 23% Ice-Silk, 77% Polyester |
| Layers (brand listing) | 4 | 4 |
| Cooling features (brand listing) | Cooling cover; cooling tech listed | Cooling cover; cooling tech listed |
| Certifications (brand listing) | CertiPUR-US; OEKO-TEX Standard 100 | CertiPUR-US; OEKO-TEX Standard 100 |
| Trial and warranty (brand messaging) | 100-night trial; 10-year limited warranty | 100-night trial; 10-year limited warranty |
| Our perceived feel | Medium-firm with a slightly gentler top | Medium-firm that reads firmer and more “held up” |
| Support (our test) | Good for average weight; less convincing for heavier hips | More stable support and alignment |
| Pressure relief (our test) | Better for lighter side sleepers | Better for back sleepers; side relief depends on weight |
| Motion isolation (our test) | Very good | Excellent |
| Responsiveness (our test) | Slow, classic memory foam | Slow, slightly more “anchored” feel |
| Edge support (our test) | Noticeably compressive when sitting | Still foam-like, but a touch steadier |
How we tested Heim Nest mattresses
We tested each mattress (see our How We Test Mattresses methodology) in real bedroom routines: full-night sleep, reading and laptop time, and repeated get-in/get-out cycles. We scored them (on a 1–5 scale) for Support, Cooling, Pressure Relief, Motion Isolation, Responsiveness, Edge Support, and Durability using consistent nightly notes and repeatable checks—edge sit, partner disturbance simulation, ease of turning, and heat buildup after two to four hours. Those seven metrics drive the scores you’ll see below.
Heim Nest Mattress: our testing experience
Heim Nest 10" Cooling Memory Foam Mattress
Our testing experience
In my first few nights, I noticed the cover’s cool handfeel right away, then the foam gradually warmed as I stayed in one spot. My lower back felt supported early in the night, but by morning I could feel a mild “settle,” as if I was relying more on the support core than the top layers. Marcus liked the initial firmness, but flagged that his hips could press deeper after a long stomach-sleep stretch.
Mia had the opposite reaction: she felt the surface was friendlier on her shoulder, and turning didn’t spike joint pressure, but she still noticed that classic memory-foam “lag” where the bed holds your shape for a beat.
What we liked
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Cool-to-touch cover at first contact
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Quiet surface when someone changes position
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Comfortable contouring for lighter side sleepers
Who it is best for
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Guest rooms and lighter-to-average sleepers
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Anyone who wants a medium-firm foam feel without a springy bounce
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Couples who care more about motion control than edge strength
Where it falls short
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Edges compress when sitting to put on shoes
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Slower response if you switch sides often
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Heavier stomach sleepers may want firmer, more braced support
Pros & cons
| Pros | Cons |
|---|---|
| Strong motion isolation | Edge support is only moderate |
| Medium-firm feel suits many sleepers | Slow response makes turning less crisp |
| Cover feels cool at contact | Foam warmth can build over hours |
| Easy mattress-in-a-box setup | Not a bouncy, responsive surface |
Details
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Price: List price starts at $299.99 (size-dependent)
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Firmness (brand rating): 6–7/10; Comfort level: medium firm
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Type: memory foam; Mattress-in-a-box: yes
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Thickness: 10 in
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Sizes listed: Twin, Full, Queen, King (availability varies)
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Dimensions (mattress overall): Twin 75" x 39"; Full 75" x 54"; Queen 80" x 60"; King 80" x 76"
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Mattress weight: Twin 39.02 lb; Full 52.2 lb; Queen 61.4 lb; King 78.4 lb
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Top style: tight top
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Cover: 23% Ice-Silk and 77% Polyester; removable cover: yes
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Number of layers: 4
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Cooling technology listed: yes; breathable: yes
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Certifications listed: CertiPUR-US; OEKO-TEX Standard 100
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Adjustable bed compatibility: yes
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Trial and warranty (brand messaging): 100-night trial; 10-year limited warranty
Review score
| Metric | Score | Remarks |
|---|---|---|
| Support | 3.9 | Good alignment for average weight; heavier hips can sink more over time |
| Cooling | 3.8 | Cover feels cool at contact; foam warmth builds through the night |
| Pressure Relief | 4.2 | Strong shoulder/hip contouring for lighter-to-average side sleepers |
| Motion Isolation | 4.3 | Very low disturbance when a partner changes position |
| Responsiveness | 3.5 | Classic memory-foam lag when switching sides |
| Edge Support | 3.4 | Noticeable compression when sitting or sleeping near the edge |
| Durability | 3.6 | Solid budget build, but less “overbuilt” than thicker or hybrid options |
| Overall Score | 3.8 | Best value when you prioritize quiet foam comfort over edge rigidity |
Heim Nest 12" Cooling Memory Foam Mattress
Our testing experience
The 12-inch version felt firmer the moment I settled in, with a flatter “platform” under my hips when I moved from back to side. Over longer sessions—especially laptop time—my lumbar area stayed more neutral, which is usually where softer foam shows its weakness for me. Marcus immediately preferred this one for stomach sleeping because he didn’t feel that slow pelvic “dip” that can tug the lower back.
Carlos liked how the mattress transitioned into the support core without a sudden drop. The trade-off showed up for Mia: after long side-sleep stretches, she felt more shoulder pressure and wanted a bit more give near the top.
What we liked
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Steadier support feel than the 10-inch model
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Excellent motion isolation with a calmer surface
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More stable for back sleepers and heavier bodies
Who it is best for
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Average-to-heavier sleepers who want medium-firm edging toward firm
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Back sleepers who want steadier lumbar support
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Couples who want quieter foam and less wobble when someone moves
Where it falls short
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Lighter side sleepers may feel shoulder pressure sooner
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Turning still feels “foam slow,” not springy
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Edges still compress compared to hybrids with reinforced perimeters
Pros & cons
| Pros | Cons |
|---|---|
| Stronger support than the 10-inch | Firmer feel can create pressure for lighter side sleepers |
| Excellent motion isolation | Responsiveness remains slow |
| Cover feels cool at contact | Edge support still not “sit-anywhere” strong |
| Firmer alignment feel in practice | Not a lively, bouncy surface |
Details
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Price: List price starts at $469.99 (size-dependent)
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Firmness (brand rating): 7–8/10; Comfort level: medium firm
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Type: memory foam; Mattress-in-a-box: yes
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Thickness: 12 in
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Sizes listed: Full, Queen, King (availability varies)
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Dimensions (mattress overall): Full 75" x 54"; Queen 80" x 60"; King 80" x 76"
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Mattress weight: Full 59.52 lb; Queen 70.55 lb; King 80.3 lb
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Top style: tight top
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Cover: 23% Ice-Silk and 77% Polyester; removable cover: yes
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Number of layers: 4
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Cooling technology listed: yes; breathable: yes
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Certifications listed: CertiPUR-US; OEKO-TEX Standard 100
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Adjustable bed compatibility: yes
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Trial and warranty (brand messaging): 100-night trial; 10-year limited warranty
Review score
| Metric | Score | Remarks |
|---|---|---|
| Support | 4.3 | Firmer platform supports hips and mid-back more consistently |
| Cooling | 3.9 | Similar cool cover feel; slightly steadier temperature in use |
| Pressure Relief | 3.9 | Good overall, but lighter side sleepers feel pressure sooner |
| Motion Isolation | 4.4 | Extremely quiet surface with minimal ripple |
| Responsiveness | 3.4 | Still slow, “memory” feel when you reposition |
| Edge Support | 3.6 | Better than the 10-inch, but still compresses under seated weight |
| Durability | 3.8 | Thicker build feels more stable over weeks of use |
| Overall Score | 3.9 | The better pick for steadier support and firmer alignment |
How the scores compare
| Mattress | Overall Score | Support | Pressure Relief | Cooling | Motion Isolation | Durability | Responsiveness | Edge Support |
|---|---|---|---|---|---|---|---|---|
| Heim Nest 10" Cooling Memory Foam Mattress | 3.8 | 3.9 | 4.2 | 3.8 | 4.3 | 3.6 | 3.5 | 3.4 |
| Heim Nest 12" Cooling Memory Foam Mattress | 3.9 | 4.3 | 3.9 | 3.9 | 4.4 | 3.8 | 3.4 | 3.6 |
The 12-inch is the more even performer overall, mostly because it keeps support higher without giving up motion isolation. The 10-inch stands out for pressure relief if you’re a lighter side sleeper. Both share similar trade-offs in responsiveness and edge support.
Which Heim Nest model fits your sleep style?
If you’re lighter or mostly a side sleeper, start with the 10-inch for its easier shoulder/hip sink and gentler top (quick refresher: how to choose a mattress). If you’re average-to-heavier, spend more time on your back, or dislike feeling your hips settle deeper by morning, the 12-inch is the steadier pick. Hot sleepers should treat both as “cool at contact” foam beds rather than actively cooling systems, and couples can choose either model for strong motion control.
What to know before you buy
These are memory-foam-first mattresses, so turning will feel slower than on a coil or latex bed—especially if you change positions often. Edge support is the biggest compromise: sitting and sleeping near the edge feels more compressive than on many hybrids. The 10-inch is less ideal for heavier stomach sleepers who need firmer pelvis support, while the 12-inch can feel firm for lightweight side sleepers who are sensitive at the shoulders and outer hips.
How Heim Nest compares with common alternatives
Heim Nest is the better fit if you want a cool-feel cover, a medium-firm foam surface, and low motion transfer in a simple all-foam build. If you want to browse a broader cooling-focused foam lineup, Zinus offers multiple cooling gel memory-foam options (see our best memory foam mattresses for more context). If you want more bounce and a more “hybrid-like” feel for turning and edge use, Linenspa’s 10" Memory Foam Hybrid adds springs under foam for a quicker response (and our best hybrid mattresses round-up is a good next stop).
How to get the best feel out of a Heim Nest mattress
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Give it a consistent break-in window before judging firmness—week-one feel and week-three feel can differ.
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If you sleep hot, use breathable sheets and avoid overly dense mattress protectors that block airflow from the cover.
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If you side-sleep on the 12-inch, a slightly thicker pillow can help keep your neck level when the shoulder doesn’t sink as much.
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If you back-sleep on the 10-inch and notice a “settle” at the waist, try a small lumbar towel roll during reading-in-bed time.
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Rotate the mattress head-to-foot on a schedule to even out the highest-load zones.
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For couples, pair it with a rigid foundation—flexy slats can exaggerate a foam “dip.”
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If you’re sensitive to slow response, the 12-inch usually feels less “sticky” when the room runs cooler at night.
FAQs
Does the 10-inch or 12-inch feel firmer?
The 12-inch reads firmer and holds hips higher, while the 10-inch feels a bit more forgiving up top.
Which is better for couples?
Both isolate motion well; the 12-inch tends to feel steadier when one person moves.
Is edge support strong?
It’s workable for short sits, but you can feel compression when sitting or sleeping near the edge.
Will it stay cold all night?
The cover feels cool at first contact, but the foam can warm up after a few hours.
