Beautyrest Black K-Class Firm Pillowtop Mattress Review

Updated June 11, 2024

Couple laying on the reviewed firm Beautyrest Black mattress

If you're considering the top-of-the-line firm feeling mattress from Beautyrest Black, read this review for more insight into whether this bed is right for you. The K-Class Firm Pillowtop is a high quality firm model. In this review, we detail how it's made and we'll also publish our first-hand pressure tests in the near future.

Comfort Scale Rating

The K-Class Firm Pillowtop mattress has a firm feel; we rate it a 3 on our 10 point Comfort Scale (a 1 is hard, 10 is softest.) This is what we call cushion firm, where it does have a firm feel but with a good amount of pressure relief still. We also carry a plush option.

Pros & Cons

  • Premium materials and construction
  • Excellent support and contouring
  • Layer of nano-coils
  • Several layers of memory foams
  • Minimal motion transfer
  • The expensive price
  • 17 1/2" tall, so you want to consider using a lower profile foundation to offset that height
  • No twin size

View Bed

Pressure Test Results

We will pressure tested the K-Class Firm Pillowtop mattress and will publish our results soon.  We test it with petite, average, and large body size people on their side and back sleeping positions to see what kind of support and comfort you can expect.

We do our pressure tests to see how the mattress performs in those different sleeping positions with various body-sized people.  We can see if there are painful pressure points or areas lacking proper support.  Both of those things can ruin your sleep and we find the testing we do shows real insight into how a mattress will perform. This mattress is very tall with many layers of materials so we'd expect it to do pretty well when we publish our results.

Below is a sample of what a pressure test looks like. We'll update our review after we pressure test the mattress and let you know how it did.

The pressure test results for this mattress are not yet available but it will be available soon.  Below is just an example.

Personalized Recommendations

Use our pressure test result to see if this is the right mattress for you!

Petite Average Large
green checkmark, meaning recommended green checkmark, meaning recommended green checkmark, meaning recommended
green checkmark, meaning recommended green checkmark, meaning recommended green checkmark, meaning recommended

Green circle with white checkmark, representing the score of recommendedRecommended Green circle to represent "good" scoreGood Red circle with a white x in the middle, representing not recommendedNot Recommended

Heatmap Image

heat map showing a sliding scale from dark blue to green to yellow to orange to red. There is mostly light blue and green showing as an imprint of the body where there's light pressure. You can see the shoulders, back and hips/buttocks. There are faint pressure points in the calf and heel areas.

The Main Beautyrest Black K-Class Firm Pillowtop Features in Detail

1. Antimicrobial Mattress Protection

Keeps mattress fresh and clean from odor causing bacteria.

2. BlackICE 4.0 with Plant-Based Cooling Technology

Cooling materials just beneath the surface enhance heat dissipation that help provide up to 18% more cooling power to keep you comfortable while you sleep.

3. SurfaceTouch Gel Memory Foam

SurfaceTouch Gel Memory Foam is sewn into the quilt to work directly under the sleep surface to quickly unlock advanced pressure point relief from the moment you lie down.

4. Firm Comfort Foam

High quality comfort foams in different levels of plushness used in various constructions to create comfort preferences.

5. Dynamic Response Memory Foam

Eliminate pressure points with the unique feeling as Dynamic Response memory foam contours and conforms to your personal shape.

6. Alpaca, Cashmere and Silk Comfort Layer

This layer is 100% natural and will help wick away moisture and enhance the cooling features within the mattress.

7. Self Response Latex

Arguably the best comfort foam in mattresses, latex provides superior pressure relief for less tossing and turning while pushing back against the body for a more supportive feel. Anti-microbial and anti-dustmite properties contribute to a healthier sleep environment.

8. 2K Nano Coil

2000 micro coils provide enhanced conformability and pressure relief with individualized back support for each unique person.

9. T3 Pocketed Coil Technology

Exclusive to Beautyrest Black, this coil works to provide individualized back support, ease of movement, and pressure point relief throughout the night.

10. Energy Foam

This durable foam utilized below the coil unit helps create a supportive, durable foundation for the no-flip mattress design.

New Features

Compared to the old model, the new K-Class Firm Pillowtop mattress has added SurfaceTouch Gel Memory Foam as well as Alpaca, Cashmere, and Silk Fibers in the comfort layers.


The K-Class Firm Pillowtop mattress has a 10-year warranty against factory defects.

Beautyrest Black K-Class FAQs

  1. What is new to the Beautyrest Black K-Class Firm Pillowtop mattress?

    The new models use SurfaceTouch Gel Memory Foam as well as Alpaca, Cashmere, and Silk Fibers in the comfort layers.

  2. Do I need to flip my Beautyrest Black K-Class mattress?

    No, Beautyrest Black beds are built from the ground up and are not designed to be flipped. This has become the new standard for mattresses today. It often means more comfort materials can be packed in.


The Black K-Class Firm Pillowtop mattress is really tall at 15.75", and has a firmer feel, even though it's a pillow top design.

The 3 inches of Dynamic Response Memory Foam set it apart from the other K-Class beds and give this model its firm feel. It also has a lot of other features and layers of supportive foam. For more options, check out the plush mattress

It has the Zoned T3 pocketed coil, a cooling material called BlackICE with Plant-Based Cooling Technology, and a layer of micro coils to help with the overall feel. We can see it's packed with premium materials and will be a very substantial bed.

If you want a high-quality firm mattress for your money, this one gives you a lot of high-end features and materials that accumulate to over 15" in height.

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Beautyrest Black K-Class Firm Pillowtop Specifications:

Product Name Simmons Beautyrest Black K-Class Firm Pillowtop Mattress

Check Price

Brand Beautyrest Black
Mattress Comfort Pillowtop
Comfort Scale Number 3
Coil Count 815
Coil Gauge 13.5
Height 15.75"
Comfort Padding Layers
  • 10 Year Manufacturer Warranty Included

Back Support System
Quilt Top of Mattress
Edge Support

About the Author Steven Bieber

Features Steven, a white man with glasses, smiling

Steven is a content writer who recently broke into the mattress industry. In his free time, he enjoys watching football and listening to music.