Kloss Mattress is best understood as a curated in-store lineup spanning traditional innersprings, hybrids, and premium pillow tops, aimed at shoppers who want to compare feels side-by-side before committing.
Product overview
| Mattress | Overall Score | Pros | Cons | Ideal For | Price |
|---|---|---|---|---|---|
| Beautyrest Black B-Class Extra Firm Tight Top Mattress | 4.4/5.0 | Exceptional support, stable surface | Too firm for many side sleepers | Back/stomach sleepers; “no-sink” fans | $959.52 |
| iComfort CF3000 Quilted II Medium Mattress | 4.4/5.0 | Balanced feel, strong cooling story | Not the plushest pressure relief | Combination sleepers; hot sleepers | $1,583.52 |
| Harmony Lux Diamond Series - Ultra Plush - Pillow Top Mattress | 4.2/5.0 | Deep pressure relief, great motion isolation | Can feel too sinky for heavier sleepers | Lightweight side sleepers; motion-sensitive couples | $1,199.52 |
| Donegal Firm Pillow Top Mattress | 4.1/5.0 | Practical “firm-with-cushion” feel | More motion transfer than dense-foam builds | Guest rooms; back sleepers who want a pillow top | $743.74–$849.99 |
Testing team takeaways
Across these four Kloss mattresses, we saw clear lanes. The Beautyrest Black B-Class Extra Firm was the most stable for my lower-back comfort, while the Harmony Lux Diamond Ultra Plush delivered the most shoulder-and-hip relief for Mia. The iComfort CF3000 Quilted II Medium hit the cleanest “middle” for mixed positions and temperature control. The Donegal Firm Pillow Top stayed approachable and supportive, but it let more movement travel than the thicker, more foam-forward builds.
Kloss Mattress comparison chart
| Spec / Test Result | Beautyrest Black B-Class Extra Firm Tight Top Mattress | iComfort CF3000 Quilted II Medium Mattress | Harmony Lux Diamond Series - Ultra Plush - Pillow Top Mattress | Donegal Firm Pillow Top Mattress |
|---|---|---|---|---|
| Feel / comfort level | Extra firm / firm | Medium | Ultra plush / soft | Firm |
| Mattress type | Pocketed coil | Hybrid | Pocketed coil | Innerspring |
| Height | 13.5" | - | 17.5" | 14.5" |
| Cooling features | Plant-based cooling tech; DualCool surface | Max Cold cover; UltraCold system; Carbon Fiber Memory Foam | InfiniCool Lux; Micro Diamond Memory Foam | EvenCool fabric (quilt) |
| Support system | Zoned T3 Pocketed Coil | 1025 wrapped coils + BestEdge foam encasement | T2 Pocketed Coil | 8" 825 Edition coil system |
| Support (our test) | Very high, especially midsection | High, even and predictable | Medium-high; plush top changes alignment | High; firmer core with softer top |
| Pressure relief (our test) | Moderate (great if you hate sink) | High (balanced contour) | Very high (deep cradle) | Medium-high (pillow top helps) |
| Motion isolation (our test) | Medium-high | High | Very high | Medium |
| Responsiveness (our test) | Medium-high | High | Medium | High |
| Edge support (our test) | High | High | Medium | Medium-high |
| Durability outlook (our test) | High | High | Medium-high (plush top) | Medium-high |
How we tested it
We ran the same routine on each mattress: back/side sleeping rotations, short stomach-sleep naps, and evening “read-and-laptop” sessions to see how the surface held posture. We scored Support, Cooling, Pressure Relief, Motion Isolation, Responsiveness, Edge Support, and Durability using repeatable checks—edge sit tests, controlled roll/turn cycles, and heat buildup observations after full nights. Marcus handled heat and edge checks, Carlos focused on alignment, and Mia stressed pressure points at shoulders and hips.
Kloss Mattress: our testing experience
Beautyrest Black B-Class Extra Firm Tight Top Mattress
Our Testing Experience
The first night on this bed felt almost “lifted”—not rigid like a board, but clearly engineered to keep me from sinking. When I rolled from back to side, my hips stayed level, and my lower back didn’t drift into that tired, hollow feeling I get after long desk days. Marcus immediately liked how the surface resisted hammocking, and Carlos noted that his mid-back stayed steady even when he slowed down his turns. Mia was the outlier: she felt pressure building at her shoulder earlier than she wanted, especially when she curled slightly.
What we liked
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Strong midsection support that keeps hips elevated
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Stable surface for reading, typing, and getting in/out
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Cooling feel stayed consistent through the night
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Good edge sit stability (shoe-tying test)
Who it is best for
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Back sleepers and stomach sleepers who want minimal sink
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Heavier sleepers who dislike foam “hug”
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People who want a stable, supportive surface for posture
Where it falls short
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Side sleepers with sensitive shoulders may feel “too up”
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Plush-comfort shoppers won’t get that cloud feel
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Pressure relief is less forgiving than the plush options
Pros & Cons
| Pros | Cons |
|---|---|
| Very stable support profile | Too firm for many side sleepers |
| Solid edge and sit support | Less “cradle” than foam-heavy builds |
| Cooling story holds up in practice | Not the best for sharp pressure points |
Details
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Price: $959.52
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Feel: Extra firm
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Mattress type: Pocketed coil
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Height: 13.5"
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Support system: Zoned T3 Pocketed Coil
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Cooling: Plant-based cooling technology; DualCool surface
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Comfort layers: AirFeel foam; firm comfort foams; gel memory foam
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Cover: Anti-microbial protection
Review Score
| Metric | Score | Remarks |
|---|---|---|
| Support | 4.8 | Hips stayed lifted; best alignment for back/stomach sleeping |
| Cooling | 4.4 | Noticeably less heat buildup than the plush builds |
| Pressure Relief | 3.9 | Adequate, but shoulder pressure showed up for Mia |
| Motion Isolation | 4.1 | Movement was controlled, though not “dead quiet” |
| Responsiveness | 4.3 | Easy to turn without feeling stuck |
| Edge Support | 4.6 | Strong sit/edge stability in daily use |
| Durability | 4.6 | Construction felt resilient with minimal early softening |
| Overall | 4.4 | A top pick if your priority is structure and stability |
iComfort CF3000 Quilted II Medium Mattress
Our Testing Experience
This was the “no drama” mattress in our room—in a good way. The surface felt cool when I first got in, and the medium feel landed in that sweet spot where my shoulders could settle without letting my hips slide out of alignment. Carlos paid attention to how the bed transitioned from the top layers into the coil support, and he kept describing it as smooth and predictable. Marcus—who’s quick to call out heat—reported fewer wake-ups from warmth on this one than on the plush pillow-top build. Mia liked it more than the extra-firm option, but she still preferred the deeper cradle of the ultra-plush model.
What we liked
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Balanced contour and lift for mixed-position sleeping
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Noticeably cool-to-touch feel at the start of the night
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Consistent support when shifting positions
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Strong perimeter feel during edge tests
Who it is best for
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Combination sleepers who rotate between back and side
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Hot sleepers wanting a cooler initial feel
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People who want support without a hard-firm surface
Where it falls short
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Plush seekers may want more surface “give”
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The feel is more “structured” than cloud-like
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If you want the deepest pressure relief, look to ultra-plush
Pros & Cons
| Pros | Cons |
|---|---|
| Strong balance of support and contour | Not as plush as pillow-top options |
| Cooling-focused build performs well | Not the “deep hug” feel some want |
| Good edge stability for a hybrid | Medium feel won’t satisfy firm-only buyers |
Details
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Price: $1,583.52
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Comfort level: Medium
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Mattress type: Hybrid
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Cooling: Max Cold cover; UltraCold system; Carbon Fiber Memory Foam
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Support: 1025 wrapped coils + BestEdge foam encasement
Review Score
| Metric | Score | Remarks |
|---|---|---|
| Support | 4.4 | Kept hips level while still letting shoulders settle |
| Cooling | 4.6 | Best temperature-control performance in our group |
| Pressure Relief | 4.4 | Strong contour without over-sinking |
| Motion Isolation | 4.3 | Partner disturbance stayed controlled |
| Responsiveness | 4.2 | Turns felt easy and not “sticky” |
| Edge Support | 4.4 | Perimeter felt secure when drifting outward |
| Durability | 4.3 | Held its feel well over repeated rotations |
| Overall | 4.4 | The most versatile pick for mixed sleep styles |
Harmony Lux Diamond Series - Ultra Plush - Pillow Top Mattress
Our Testing Experience
This was the “sink in and exhale” bed. The pillow top immediately softened the first contact points—Mia’s shoulders and outer hips relaxed faster here than on any other model we tried. I felt more contouring through my ribs and hips when side sleeping, and Carlos said he could feel the bed absorbing pressure instead of pushing back. The trade-off showed up with Marcus: he described his hips settling deeper than he wanted, and he had to reposition to keep that “straight line” from shoulders to knees. Motion isolation was excellent—when someone moved, the surface swallowed most of it—but the edge compressed more than the firmer options.
What we liked
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Deep pressure relief for shoulders and hips
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Very strong motion isolation in real sleep
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Plush comfort that makes side sleeping feel effortless
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Cooling features helped, even with a thick comfort stack
Who it is best for
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Lightweight-to-average side sleepers
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Couples who prioritize a calmer surface
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Anyone chasing a plush, premium “hotel-bed” feel
Where it falls short
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Heavier sleepers may sink too much at hips
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Edge support isn’t as stout as the firmer models
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Responsiveness is slower than the springier builds
Pros & Cons
| Pros | Cons |
|---|---|
| Best pressure relief of the group | Can feel too soft for heavier sleepers |
| Excellent motion isolation | Edge compression is noticeable |
| Plush comfort with premium materials | Turning is slower than on firmer hybrids |
Details
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Price: $1,199.52
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Firmness: Ultra plush
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Mattress type: Pocketed coil
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Height: 17.5"
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Cover: Seaqual sustainable fabric
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Cooling: InfiniCool Lux; Micro Diamond Memory Foam
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Support system: T2 Pocketed Coil
Review Score
| Metric | Score | Remarks |
|---|---|---|
| Support | 4.0 | Supportive, but the plush top changes posture for heavier bodies |
| Cooling | 4.3 | Cooling features helped offset the thick comfort layers |
| Pressure Relief | 4.7 | Best shoulder/hip comfort, especially for side sleeping |
| Motion Isolation | 4.6 | Movement was muted more than any other model here |
| Responsiveness | 3.8 | More effort to turn compared with firmer builds |
| Edge Support | 3.9 | Edge compression was noticeable when sitting or drifting |
| Durability | 4.0 | Plush surface suggests more long-term softening risk |
| Overall | 4.2 | The comfort pick if pressure relief outranks everything else |
Donegal Firm Pillow Top Mattress
Our Testing Experience
This felt like the “practical upgrade” mattress: you can tell it’s built to be firm, but the pillow top takes the edge off. I got a nice lift under my lower back while still feeling some cushion at my shoulders when I rolled to my side. Carlos liked the straightforward, supportive alignment—less contour than the iComfort, but no confusion about where the support starts. Marcus’s take was blunt: good support, decent cooling, but you notice movement more when the other person shifts. Mia didn’t hate it, but she said her shoulder wanted a touch more softness on longer side-sleep stretches.
What we liked
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Firm, supportive base with a more comfortable top layer
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Easier turning than the ultra-plush pillow top
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Solid “sit and stand” stability for daily routines
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Straightforward feel that’s easy to predict
Who it is best for
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Back sleepers who want a pillow top without going plush
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Guest rooms and multi-sleeper households
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People who want firmer support but not a hard surface
Where it falls short
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Motion transfer is more noticeable than on foam-forward builds
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Side sleepers may still want more shoulder give
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Cooling is solid, not standout
Pros & Cons
| Pros | Cons |
|---|---|
| Supportive “firm-with-cushion” feel | More motion transfer than plush hybrids |
| Good balance for back and combo sleepers | Not soft enough for sensitive shoulders |
| Approachable price tier in this set | Cooling doesn’t lead the pack |
Details
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Price: $743.74–$849.99
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Comfort level: Firm
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Mattress type: Innerspring
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Height: 14.5"
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Quilt: EvenCool fabric; PillowSoft Aire
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Comfort layers: Cushion Quilt foam; Cool Twist gel memory foam
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Support system: 8" 825 Edition coil system
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Trial period: 120-night comfort guarantee
Review Score
| Metric | Score | Remarks |
|---|---|---|
| Support | 4.2 | Keeps posture stable with a touch of surface cushion |
| Cooling | 4.1 | Stayed comfortable, but not as cool as the CF3000 |
| Pressure Relief | 4.1 | Better than a tight-top firm, still short of ultra-plush |
| Motion Isolation | 3.9 | Partner movement traveled more than in foam-heavy builds |
| Responsiveness | 4.3 | Easy turning and a more spring-forward feel |
| Edge Support | 4.1 | Solid, though not as locked-in as the B-Class |
| Durability | 4.2 | Firm build should hold shape well in routine use |
| Overall | 4.1 | A sensible “firm pillow top” option with good all-around value |
Compare performance scores of these mattresses
| Mattress | Overall Score | Support | Pressure Relief | Cooling | Motion Isolation | Durability | Responsiveness | Edge Support |
|---|---|---|---|---|---|---|---|---|
| Beautyrest Black B-Class Extra Firm Tight Top Mattress | 4.4 | 4.8 | 3.9 | 4.4 | 4.1 | 4.6 | 4.3 | 4.6 |
| iComfort CF3000 Quilted II Medium Mattress | 4.4 | 4.4 | 4.4 | 4.6 | 4.3 | 4.3 | 4.2 | 4.4 |
| Harmony Lux Diamond Series - Ultra Plush - Pillow Top Mattress | 4.2 | 4.0 | 4.7 | 4.3 | 4.6 | 4.0 | 3.8 | 3.9 |
| Donegal Firm Pillow Top Mattress | 4.1 | 4.2 | 4.1 | 4.1 | 3.9 | 4.2 | 4.3 | 4.1 |
The most evenly strong performers were the Beautyrest Black B-Class and the iComfort CF3000, each landing at 4.4 overall but for different reasons—support dominance versus balance and cooling. The Harmony Lux Diamond clearly wins pressure relief and motion isolation, but it gives some of that back in edge stability and responsiveness. Donegal is the pragmatic middle: good scores across the board, just without a single “category-leading” spike.
How to choose the Kloss Mattress?
If you want the firmest, most posture-stable surface, start with the Beautyrest Black B-Class. If you rotate positions and want a cooler, more balanced feel, the iComfort CF3000 is the safest pick. If you’re a lighter side sleeper or you wake up to pressure points, the Harmony Lux Diamond is the comfort-first option. If you want a firmer bed with a pillow top for everyday versatility (including guest-room use), Donegal is the practical buy.
Limitations
The Kloss lineup here splits sharply by feel: the extra-firm Beautyrest can run harsh for shoulder-sensitive side sleepers, while the ultra-plush Harmony Lux can let heavier hips settle too deeply. The iComfort CF3000 is balanced, but it won’t satisfy shoppers chasing a true pillow-top “sink.” Donegal is supportive and approachable, but it transmits more movement than the thicker comfort stacks.
Kloss Mattress vs. alternatives
Why choose these models
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In-store comparison across distinct feels (extra firm, medium hybrid, ultra plush, firm pillow top)
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Clear segmentation: stability vs. plush relief vs. balanced cooling
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Strong options for hot sleepers and motion-sensitive sleepers
Alternatives to consider
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Saatva Classic: for a luxury innerspring feel with targeted lumbar design elements
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TEMPUR-Adapt: for deep foam contouring and strong motion cancellation
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Brooklyn Bedding Aurora Luxe Cooling: if cooling is the single biggest priority
Pro tips for Kloss Mattress
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Give your body time to adapt by keeping pillow height consistent while you evaluate the mattress feel.
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For extra-firm builds, use a slightly plusher quilted protector to soften the first-contact feel without changing support.
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If you sleep hot, prioritize breathable sheets first; then decide whether you still need a cooling protector.
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Run an edge-support check the way you actually live—sitting to put on socks, not just lying down.
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For side sleeping discomfort, adjust your pillow for neck alignment before blaming the mattress.
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Rotate (head-to-foot) on a consistent schedule if the mattress is one-sided and rotation is allowed.
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If you share a bed and wake easily, place your heavier sleeper on the side with stronger perimeter feel.
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Use a supportive foundation and re-check fasteners; a wobbly base can masquerade as “bad support.”
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If you feel stuck in plush builds, try a smoother fitted sheet and lighter comforter to reduce friction.
FAQs
What’s the best Kloss mattress for back and stomach sleepers?
The Beautyrest Black B-Class Extra Firm was the most posture-stable in our nightly use.
Which model felt coolest overall?
The iComfort CF3000 stayed the most consistent for heat control.
Which mattress was best for shoulder pressure?
Harmony Lux Diamond offered the deepest shoulder and hip relief.
Which one handled partner movement best?
Harmony Lux Diamond muted motion the most, followed by the iComfort CF3000.
