Quick verdict
What the original K-Class offered
The version described in Yawnder’s earlier review used T3 pocketed coils and multiple comfort foams, including memory foam and cooling-focused materials. The plush configuration suited shoppers who wanted substantial cushioning over a coil support system. Cool-to-the-touch materials can affect initial feel, but they do not guarantee a particular overnight temperature.
The K-Class was sold in different comfort configurations. If you are trying to identify an existing mattress, check its law tag and purchase records; the description of the plush version does not necessarily match a firmer model.
How the current Black collection compares
Beautyrest currently groups its Black collection into Series One through Series Four, with different firmness and top choices. The company also offers Black Hybrid models. A series number alone does not establish a direct K-Class replacement: compare the specific construction, surface feel, height and configuration.
See our Beautyrest Black guide for more context and review the manufacturer’s specifications for the exact current model.
Before buying a replacement
- Test the exact firmness and top style if possible; a plush pillow top can feel very different from a firm smooth top.
- Measure the mattress height against your sheets, frame and preferred bed height.
- Confirm foundation and adjustable-base compatibility with the seller.
- Compare delivery, old-mattress removal, return charges and the written warranty. Clearance and floor models may have different terms.
Frequently asked questions
Were all K-Class mattresses plush?
No. The line included more than one comfort configuration, including firmer options.
Is a current Series Three identical to a K-Class?
Not necessarily. Names, layers and available feels have changed, so compare the exact models rather than assuming a one-to-one replacement.
Does a cooling cover keep every sleeper cool all night?
No. Initial surface feel and overnight temperature are different, and bedding, room temperature and individual preferences matter.
Standardized test data
Every mattress in the current program follows the same rubric and order, combining instrument-measured categories with hands-on evaluations so scores are comparable across brands.
| Measurement | Result | How to read it |
|---|---|---|
| Firmness | 6 | 1–10 scale (6.5 = medium-firm) |
| Construction | Hybrid | Foam / hybrid / latex / airbed |
| Profile height (Yawnder measured) | Not measured | inches — measured on our own sample |
| Motion transfer | 7.8 | score /10 — higher is less disturbance |
| Edge support | 8.8 | score /10 — sitting and sleeping edge |
| Temperature | 8.4 | score /10 — higher sleeps cooler |
| Pressure relief | 9 | score /10 — shoulder and hip |
| Spine alignment | 8.8 | score /10 — neutral posture |
| Ease of movement | Not measured | score /10 — repositioning speed |
| Expected durability | 8.6 | score /10 — projected 5-year hold |
| Off-gassing | 8.2 | score /10 — higher is less smell |
| Queen price | $3,499 | MSRP before seasonal discounts |
| Manufacturer sleep trial | 100 nights | when bought direct from the brand |
| Manufacturer warranty | 10-Year Limited | as published by the manufacturer; applies wherever you buy |
| Last test date | August 27, 2026 | date of our most recent standardized test session |
How this score is built
Support and spine alignment 25% · pressure relief 20% · temperature 15% · motion transfer 15% · edge support 10% · durability 10% · value 5%. Scores come from standardized instrument measurements and structured hands-on evaluations using the same Yawnder testing rubric. Read the full rubric.
Find a better mattress for you
Use Yawnder's standardized test data to compare this mattress with other models, or answer a few questions and narrow the field by sleep position, feel and priorities.
Compare before you buy
Compare this mattress against 142 tested mattresses
Sort all 142 mattresses we have tested by pressure relief, support, cooling, motion isolation, edge support, price, trial and warranty, then filter by how you actually sleep. Of those, 84 hold a complete standardized record and 41 a partial standardized record.