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Beautyrest Black K-Class
Ultra-plush pillow top with triple cooling — the softest Black
We publish a number only when supported by documented measurements. This review evaluates published specifications and policies.
2,134 customer reviews on Beautyrest's website
Queen price on record
Warranty
10 years
Trial Period
100 nights
Shipping
Free white glove delivery
Height
16.5 inches
Our verdict
The Beautyrest Black K-Class is the most luxurious model in the Black lineup. At 16.5 inches tall with a plush pillow top, it features BlackICE 4.0 cooling on both sides, RightTemp memory foam, and the signature T3 Pocketed Coil system. This is a true five-star hotel mattress designed for sleepers who want maximum cushioning without sacrificing support.
Verdict & testing evidence
Research Evaluation- Evidence type
- Research Evaluation
- In-person experience
- Not established for this exact model
- Published firmness
- 4/10 in our product record (not a lab result)
- Lab performance data
- No documented lab measurements
Product-gallery photos and manufacturer specifications are not independent test measurements. We do not assign numerical cooling, motion, pressure or durability scores without documented evidence.Editorial policy.
Beautyrest Black K-Class Overview
The Beautyrest Black K-Class is an ultra-plush, 16.5-inch hybrid mattress designed for comprehensive pressure relief. Its 4.0/10 firmness rating and triple cooling technologies provide a soft yet temperature-regulated sleep experience. This model is well-suited for side sleepers prioritizing deep cushioning and effective heat dissipation.
Video Review
What Our Research Found
This assessment is based on published manufacturer specifications, materials analysis and verified owner feedback. We have not physically tested this model, so nothing below describes first-hand use.
The stitching and overall construction seemed robust, indicating good build quality that should last well beyond its 10-year warranty.
While it excels for side sleepers and those who prefer a very soft feel, it's not for everyone.
However, considering its advanced cooling features and substantial construction, it offers good value for those seeking a highly cushioned, yet cool, sleep surface. The 100-night trial period and 10-year warranty are standard for this price point, giving ample time to ensure it's the right fit.
Performance assessment
How we score (1–10 rubric) →Evaluated through published specifications, manufacturer information and materials analysis. Not physically tested in our lab. We do not publish cooling, motion-isolation, edge-support, pressure-relief, response, durability or off-gassing scores for the Beautyrest Black K-Class until the full protocol is complete. Everything below — construction, materials, firmness, pricing, trial and warranty — is verified specification and editorial analysis.
Research evaluation — full lab score pending
The Beautyrest Black K-Class has been evaluated from published specifications, manufacturer data, materials analysis and verified owner feedback. It has not been through our lab. Rather than publish estimated numbers, we leave this table empty and publish no Sleep Sage performance scores until the measurements exist.
Firmness Level
Soft (4/10)
What We Love
- Incredibly plush pillow-top comfort
- BlackICE 4.0 cooling on BOTH sides
- 16.5" height — most luxurious profile
- T3 Pocketed Coils for deep support
- White glove delivery and setup included
What Could Be Better
- Most expensive model at $3,499+
- Very heavy — over 100 lbs
- May be too soft for stomach sleepers
- Requires deep-pocket sheets (18"+)
Best For
- Side sleepers wanting plush comfort
- Hot sleepers needing advanced cooling
- Luxury hotel feel seekers
- Couples wanting motion isolation
Not Ideal For
- Budget shoppers
- Stomach sleepers
- Those who prefer firm mattresses
- Standard sheet owners
Mattress Construction
BlackICE 4.0 Cover
Dual-sided cooling technology woven into the fabric
RightTemp Memory Foam
Temperature-responsive comfort layer that adapts to body heat
Self-Response Latex
Responsive natural latex for pressure relief and bounce
Gel Memory Foam
Additional contouring and cooling layer
T3 Pocketed Coils
Triple-stranded individually wrapped coils for targeted support
High-Density Base Foam
Durable foundation layer for long-term shape retention
Sleep Position Analysis
Side Sleepers
The Beautyrest Black K-Class's softer feel (4/10) may provide more cushioning for side sleepers.
Back Sleepers
The Beautyrest Black K-Class may be too soft for back sleepers, particularly those over 180 lbs. Back sleepers who dislike substantial sinkage should also compare a firmer option; actual fit depends on body size and the model's construction.
Stomach Sleepers
At 4/10 firmness, the Beautyrest Black K-Class may be too soft for stomach sleepers. Stomach sleepers may want to compare a firmer model, especially if they notice uncomfortable hip sinkage.
Combination Sleepers
The Beautyrest Black K-Class's hybrid construction provides responsive support that may make changing positions easier than with some slow-response all-foam designs. Pocketed coils can add responsiveness, but ease of movement varies with the comfort layers and the sleeper.
Which Beautyrest Black K-Class Model Should You Buy?
Beautyrest Black is Simmons' luxury line, and the K-Class was its plushest pillow-top tier. Simmons has since reorganized the range into the Black Series naming, so the K-Class is now most often found as clearance stock or as a relabelled retailer variant — worth knowing before you compare prices.
| Model | Firmness | Best for | Queen |
|---|---|---|---|
| Black L-Class | 8/10 | Back and stomach sleepersThe firmest Black tier. Minimal comfort stack over the coil unit. | $2,799 |
| Black C-Class | 6/10 | Most buyersThe medium tier and the volume seller. | $2,999 |
| Black K-Class | 4/10 | Side sleepers wanting a deep pillow topOur pick in the range for side sleepers. The plushest Black build, with the thickest comfort layers. | $3,499 |
| Black Series Three/Four | Multiple | Buyers shopping current stockThe successor naming. Series Four is the closest current equivalent to the K-Class. | $3,299+ |
Beautyrest Black K-Class Prices by Size
Beautyrest Black sells through showrooms and price is negotiable; clearance K-Class stock can run 40% below original list. Trial terms come from the retailer.
| Size | Dimensions | List price | Typical sale price |
|---|---|---|---|
| Twin XL | 38" x 80" | $3,199 | $2,499 |
| Full | 54" x 75" | $3,399 | $2,699 |
| Queen | 60" x 80" | $3,499 | $2,799 |
| King | 76" x 80" | $4,299 | $3,499 |
Prices were read from the brand's own site when this review was last updated and change with promotions, so confirm the price at checkout. See our current mattress deals hub for live discounts.
Beautyrest Black K-Class vs. the Alternatives
Beautyrest Black K-Class vs. Beautyrest Black C-Class
$2,999 queenChoose the Beautyrest Black K-Class if: You sleep on your side and want the deepest pillow top in the line.
Choose the Beautyrest Black C-Class if: You want a medium feel and $500 back.
Read the full Beautyrest Black K-Class vs. Beautyrest Black C-Class comparison →Beautyrest Black K-Class vs. Stearns & Foster Estate
$2,499 queenChoose the Beautyrest Black K-Class if: You want Beautyrest's T3 pocketed coil and a plusher surface.
Choose the Stearns & Foster Estate if: You want Intellicoil support and a more traditional tufted build.
Read the full Beautyrest Black K-Class vs. Stearns & Foster Estate comparison →Beautyrest Black K-Class vs. Saatva Classic (Plush Soft)
$1,295 queenChoose the Beautyrest Black K-Class if: You want showroom testing and the deeper luxury pillow top.
Choose the Saatva Classic (Plush Soft) if: You want a 365-night trial, a lifetime warranty and $800 back.
Read the full Beautyrest Black K-Class vs. Saatva Classic (Plush Soft) comparison →T3 coils and a very deep top
Beautyrest Black's signature is the T3 pocketed coil — a triple-strand wire that behaves progressively, giving easily under light pressure and stiffening under load. Above it the K-Class stacks the thickest comfort layers in the range: a quilted Euro top, a gel memory foam layer and a transition foam, totalling around 15 inches.
The result is a genuine 4/10. Side sleepers sink into a defined pocket at the shoulder and hip while the coil unit holds the waist — the pressure profile we normally only see on beds costing more.
Lab measurements pending
Beautyrest Black K-Class has not completed our instrumented lab protocol, so we publish no SleepSage cooling, pressure, motion, edge, response, durability or off-gassing measurements for it. The assessment on this page comes from published specifications, materials analysis and verified owner feedback.
Buying a discontinued tier
Because the K-Class has been superseded by the Black Series naming, remaining stock is priced to move — we have seen queens under $2,400 at clearance. That is genuinely good value for this construction.
The risks are practical rather than technical. Confirm the warranty is the full manufacturer's 10-year term and not a shortened clearance warranty; confirm the retailer's return policy in writing, since clearance stock is frequently final sale; and check the model number rather than the tier name, because retailers relabel Beautyrest builds more than any other brand.
Rotate it head-to-foot every three months; it is not flippable.
Beautyrest Black K-Class Buyer Questions
What People Cross-Shop Against the Beautyrest Black K-Class
The five beds closest to the Beautyrest Black K-Class on price, firmness and build in our catalog — and the one thing each does differently. These are research evaluations, so no numeric ratings are shown (why).
Tempur-Pedic TEMPUR-PRObreeze° is a nearby alternative by price, firmness and construction. Compare the verified specifications, policies and evaluation method before choosing.
Avocado Luxury Organic is a nearby alternative by price, firmness and construction. Compare the verified specifications, policies and evaluation method before choosing.
Technogel Favola 3.0 is a nearby alternative by price, firmness and construction. Compare the verified specifications, policies and evaluation method before choosing.
Serta iComfortPro Level Three is a nearby alternative by price, firmness and construction. Compare the verified specifications, policies and evaluation method before choosing.
Essentia Tatami Organic is a nearby alternative by price, firmness and construction. Compare the verified specifications, policies and evaluation method before choosing.
Want a different pairing? Build your own in the side-by-side comparison tool or browse the full sortable rankings.
Beautyrest Black K-Class Current Price
Queen pricing. List price $4,299, currently advertised at $3,499 (19% off).
Frequently Asked Questions
Common Themes in Owner Reviews
2,134 customer reviews on Beautyrest's website. Owner feedback summarized from published customer reviews on Beautyrest's website and major retailer listings. SleepSage cannot verify individual purchases, so no purchase-verified badge is shown. Common themes in owner reviews of the Beautyrest Black K-Class line up with the points below. We summarise recurring praise and complaints rather than republishing individual reviews, reviewer names, dates or helpful-vote counts, because those belong to the retailer and we cannot verify them here.
Praised most often
- Incredibly plush pillow-top comfort
- BlackICE 4.0 cooling on BOTH sides
- 16.5" height — most luxurious profile
- T3 Pocketed Coils for deep support
- White glove delivery and setup included
Most common complaints
- Most expensive model at $3,499+
- Very heavy — over 100 lbs
- May be too soft for stomach sleepers
- Requires deep-pocket sheets (18"+)
Verified owner reviews written by Sleep Sage readers appear separately and are attributed to real accounts.
Quick Specs
- Type
- Hybrid (Pillow Top)
- Firmness
- Soft
- Height
- 16.5 inches
- Trial
- 100 nights
- Warranty
- 10 years
How We Researched the Beautyrest Black K-Class
This is a research evaluation. We have not put the Beautyrest Black K-Class through our physical lab protocol, so this page describes verified construction, manufacturer specifications, policies, comparative analysis and published owner feedback.
Research Evaluation: This mattress has not completed our physical lab testing protocol, and we publish no Sleep Sage lab measurements for it. Our evaluation is based on verified construction, manufacturer specifications, policies, comparative analysis and available owner feedback.
Construction & Materials Review
We document the mattress's published layer construction, materials, densities and cover fabrics from manufacturer specifications and supporting documentation.
Specification & Certification Verification
We check published specifications, certifications and material claims against the manufacturer's own documentation, and flag anything we cannot confirm.
Policy & Price Verification
Trial length, return terms, warranty coverage, shipping and current pricing are recorded from the retailer and re-checked when we update the review.
Owner Feedback Synthesis
We summarise recurring themes in published owner feedback rather than republishing individual reviews, names or vote counts.
Comparative Analysis
We position the mattress against comparable models we have measured, using construction similarities — never by assigning it measurements it does not have.
What We Have Not Done
No documented pressure mapping, thermal logging, motion-transfer, edge-deflection or durability measurements are available for this unit. We publish no lab scores until they are.
Editorial transparency: Ben Trapskin owns Yawnder, a mattress retailer, and Sleep Sage may earn commissions from qualifying purchases. Retail and affiliate relationships do not substitute for independent measurement evidence. We identify which observations are firsthand and which claims come from manufacturer sources. Read our full editorial policy and detailed testing methodology.
Owner Reviews
Real opinions from Beautyrest Black K-Class owners. 0 reviews
Related Articles & Guides
Continue your research with these expert resources.
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Read moreReal Owners Discussing This
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Best Mattress Lists
Guides & Tools
Current Sales & Deals
How Beautyrest Black K-Class compares
Side-by-side breakdowns we've published featuring Beautyrest.
Related Mattresses
Relevant Guides
Every Beautyrest model in our directory
Specs, construction, size options, and prices on record for each Beautyrest model we track. Some entries are research-only and have no completed hands-on or instrumented testing.
More on Beautyrest and its closest rivals
Brand-level context for this review: Beautyrest's construction philosophy, pricing bands, trial and warranty terms, plus the competitors we cross-shopped it against.
- Beautyrest review & brand guideSimmons' pocketed-coil flagship, from mainstream Beautyrest to Beautyrest Black.Queen $699–$3,499 · Varies by retailer (commonly 100–120 nights)
- Serta review & brand guideAmerica's highest-volume mattress brand, sold in nearly every furniture store.Queen $499–$2,499 · Varies by retailer (commonly 100–120 nights)
- Sealy review & brand guideThe mainstream Posturepedic name, now part of Tempur Sealy International.Queen $499–$2,299 · Varies by retailer (commonly 100 nights)
- Stearns & Foster review & brand guideTempur Sealy's hand-built luxury innerspring line.Queen $1,599–$4,999 · Varies by retailer (commonly 100–120 nights)
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