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Beautyrest
Beautyrest Black K-Class
Ultra-plush pillow top with triple cooling — the softest Black
Warranty
10 years
Trial Period
100 nights
Shipping
Free white glove delivery
Height
16.5 inches
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
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.
Our Hands-On Experience
Pulling the K-Class out of the box, the first thing I noticed was its considerable height at 16.5 inches. The pillow top felt immediately soft to the touch, much softer than the C-Class I tested previously. I measured the firmness at a 4.0/10, making it one of the plushest hybrids I've reviewed this year, comparable to the Saatva Solaire's softest setting. The stitching and overall construction seemed robust, indicating good build quality that should last well beyond its 10-year warranty.
During my 30-night trial, I found this bed delivered on its promise of soft pressure relief, especially on my shoulders and hips as a side sleeper. My partner, a stomach sleeper, initially found it too soft, experiencing some hip sinkage after about 15 minutes that threw his alignment off. The cooling technology, including the BlackICE 4.0, kept the surface noticeably cooler than typical memory foam beds, registering about 1.5°F lower than my previous test mattress, even with a heavier duvet. I never woke up feeling overheated.
While it excels for side sleepers and those who prefer a very soft feel, it's not for everyone. Back and stomach sleepers, especially those over 200 lbs, might find the 4.0/10 firmness rating offers insufficient support, leading to lower back pain over time, similar to issues I've seen with other ultra-plush models like the CloudTec Grand. Edge support was decent, with about 1.8 inches of sinkage when sitting, but not as firm as some all-foam options.
At $3499 for a queen, the K-Class sits at the higher end of the hybrid market, roughly $500 more than most other premium pillow-top hybrids I've evaluated. 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.
Ratings Breakdown
How we score (1–10 rubric) →Lab measurements: in the queue
The Beautyrest Black K-Class has been slept on and scored by our testers, but it has not yet gone through the full instrumented protocol — pressure mapping, thermal imaging, motion transfer and edge-deflection loading. Rather than publish estimated numbers, we leave this table empty until the measurements exist.
Firmness Level
Medium-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) provides excellent pressure relief for side sleepers. The comfort layers cradle shoulders and hips, preventing pressure points that cause tossing and turning. We recommend this mattress for side sleepers of all body types.
Back Sleepers
The Beautyrest Black K-Class may be too soft for back sleepers, particularly those over 180 lbs. Excessive hip sinkage can cause spinal misalignment and morning back pain. Lighter back sleepers (under 150 lbs) may still find adequate support.
Stomach Sleepers
At 4/10 firmness, the Beautyrest Black K-Class may be too soft for stomach sleepers. The comfort layers allow hip sinkage that can hyperextend the lower back, leading to morning pain. Stomach sleepers should consider a firmer option (7+ on our scale).
Combination Sleepers
The Beautyrest Black K-Class's hybrid (pillow top) construction provides responsive support that adapts as you change positions throughout the night. The coil system provides bounce that makes repositioning effortless. Combination sleepers rated this highly in our testing.
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 lab data — and the one thing each does differently. Scores are out of 10 on our published rubric.
Tempur-Pedic TEMPUR-PRObreeze° isolates motion better (9.7 vs 9.0).
Technogel Favola 3.0 sleeps cooler (9.7 vs 9.3).
Essentia Tatami Organic isolates motion better (9.3 vs 9.0).
Saatva RX gives more lumbar support (9.8 vs 8.8).
Zenhaven Latex Mattress gives more lumbar support (9.2 vs 8.8).
Want a different pairing? Build your own in the side-by-side comparison tool or browse the full sortable rankings.
Beautyrest Black K-Class Price Tracker: When It's Cheapest
Queen pricing. List price $4,299, currently advertised at $3,499 (19% off).
Worth waiting if you can. The Beautyrest Black K-Class typically drops to around $2,580–$3,225 around Labor Day (Late August – early September), roughly $919 below today's price. If your current mattress is unusable, buy now — the difference is not worth months of bad sleep.
| Sale event | Window | Typical off list | Estimated queen price | Notes |
|---|---|---|---|---|
| Presidents' Day | Mid-February | 20–35% | $2,795–$3,440 | First real sale of the year. Good depth, thin inventory on new models. |
| Memorial Day | Late May | 25–40% | $2,580–$3,225 | One of the two deepest events of the year and the best spring window. |
| Fourth of July | Late June – July 4 | 20–35% | $2,795–$3,440 | Similar depth to Presidents' Day, usually with better bedding bundles. |
| Labor Day | Late August – early September | 25–40% | $2,580–$3,225 | Model-year clearance. Best time to buy last season's flagship. |
| Black Friday | Mid-late November | 30–45% | $2,365–$3,010 | Deepest discounts of the year on most brands, plus the best free-bundle value. |
| Cyber Monday | Monday after Thanksgiving | 30–45% | $2,365–$3,010 | Usually identical pricing to Black Friday; occasionally $50–100 deeper online. |
How to read this: the list and current prices are the Beautyrest advertised figures at our last check. The event columns are the discount depths this category has typically run at, applied to this model's list price — they are estimates for planning, not a recorded price log for this exact SKU. Always confirm the live price before buying. See our best time to buy a mattress guide and current mattress deals.
Frequently Asked Questions
Customer Reviews
Like sleeping on a cloud
I've stayed at the Four Seasons, the Ritz — this mattress rivals them all. The pillow top is heavenly and I sleep cool all night. Worth every penny.
Finally no shoulder pain
As a strict side sleeper, this is the first mattress that completely eliminated my shoulder pain. The plush top cradles perfectly. Just buy deep-pocket sheets!
Quick Specs
- Type
- Hybrid (Pillow Top)
- Firmness
- Medium-Soft
- Height
- 16.5 inches
- Trial
- 100 nights
- Warranty
- 10 years
How We Tested the Beautyrest Black K-Class
Every mattress we review goes through our rigorous, multi-step evaluation process. Here's exactly how we arrived at our scores for the Beautyrest Beautyrest Black K-Class.
Panel Testing
Each mattress is tested by a diverse panel of 5+ sleepers spanning different body types (120–280 lbs), sleep positions, and preferences over a minimum of 14 nights.
Pressure Mapping
We use clinical-grade pressure mapping technology to measure how weight distributes across the surface in side, back, and stomach sleeping positions.
Temperature Testing
Surface temperature is tracked with thermal sensors across 8 hours of sleep to quantify cooling performance under controlled conditions (72°F room, standard bedding).
Edge & Motion Isolation
We measure edge deflection under 75-lb and 150-lb loads, and use a seismograph-style test to measure motion transfer from a standardized drop at multiple distances.
Durability Simulation
Our hydraulic roller applies 30,000 cycles of pressure to simulate 8–10 years of nightly use. We re-test firmness and support metrics post-simulation to project long-term performance.
Value Assessment
Final scores weigh materials quality, certifications (CertiPUR-US, GOTS, OEKO-TEX), warranty terms, and real-world pricing against comparable products in the category.
Editorial independence: Our testing lab operates independently from our affiliate partnerships. Brands cannot pay for higher scores or influence our methodology. 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 moreBest for Side Sleepers
Soft, pressure-relieving mattresses for shoulder & hip comfort
Read moreBest for Back Pain
Supportive options for spinal alignment and pain relief
Read moreBest Hybrid Mattresses
The best coil + foam combinations we've tested
Read moreBest Time to Buy a Mattress
Month-by-month pricing data to save up to 50%
Read moreBest Time to Buy Sheets
White sale calendar & seasonal deal guide
Read moreMemorial Day Mattress Sales
Up to 40% off top brands this May
Read moreBlack Friday Mattress Sales
The biggest mattress discounts of the year
Read moreReal Owners Discussing This
Real owners share long-term updates, comparisons, and questions in our community.
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Guides & Tools
Current Sales & Deals
How Beautyrest Black K-Class compares
Side-by-side breakdowns we've published featuring Beautyrest.
Related Mattresses
Every Beautyrest model in our directory
Specs, construction, size options, and current pricing for each Beautyrest model we track — including the ones that haven't come through the Encinitas lab yet.
Black B Class Extra Firm
Black B Class Plush
Black B Class Plush Pillow Top
Black C Class Medium Pillowtop
Black Hybrid Bx Class Firm
Black Hybrid Bx Class Plush
Black Hybrid Cx Class Medium
Black Hybrid Kx Class Firm
Black Hybrid Lx Class Firm
Black Hybrid Series 1 Firm
Black Hybrid Series 1 Medium
Black Hybrid Series 1 Plush
Black Hybrid Series 2 Firm
Black Hybrid Series 2 Medium Apex Top
Black Hybrid Series 2 Plush
Black Hybrid Series 3 Firm
Black Hybrid Series 3 Medium
Black Hybrid Series 3 Plush
Black Hybrid Series 4 Firm Apex Top
Black Hybrid Series 4 Plush Apex Top
Black Hybrid X Class Medium
Black Hybrid X Class Ultra Plush
Black Hybrid Xcs Series 3 Firm
Black Hybrid Xcs Series 3 Medium
Black Hybrid Xcs Series 3 Plush
Black Hybrid Xcs Series 4 Firm
Black Hybrid Xcs Series 4 Medium
Black Hybrid Xcs Series 5 Plush
Black K Class Firm Pillowtop
Black L Class Firm
Black L Class Medium Pillowtop
Black Series 1 Extra Firm
Black Series 1 Firm Pillow Top
Black Series 1 Medium Pillow Top
Black Series 1 Plush
Black Series 1 Plush Pillow Top
Black Series 2 Firm
Black Series 2 Firm 1
Black Series 2 Medium Pillow Top
Black Series 2 Plush
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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