Beautyrest Black K-Class Medium Mattress Review

Updated January 21, 2022

The K-Class Medium is a reasonable choice in the Beautyrest Black K-Class lineup.  In this model, you get the premium features including micro coils in a medium feeling bed for $3,899 (queen size.)   Choosing a mattress can be a confusing journey so we've compiled detailed hands-on reviews to make it easier to understand and compare.

Comfort Scale Rating

The K-Class Medium mattress has a medium feel; we rate it a 5 on our 10 point Comfort Scale (a 1 is hard, 10 is softest.)  It will appeal to most sleepers because it's not too hard or soft.  A 5 also makes a good compromise choice if you have a partner with different preferences. If this does not work for you, this mattress has a firm and plush option. 

Expert Video Review

Here’s our quick K-Class Medium Video Review. It highlights the features, benefits, and our impression. 

Pros & Cons

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 of $3,899 (queen-size)

See the bed

Pressure Test Results

We pressure tested the K-Class Medium 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. (Learn how we test.) 

We do our pressure tests to see how the mattress performs in those different sleeping positions with small, medium, and large body size people.  The K-Class Medium has a layer of nano coils and it's also loaded with other premium foam layers.  It has a medium feel so we don't expect to see too many pressure points and we also expect it to demonstrate good support.

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.

BACK SLEEPER SIDE SLEEPER
LARGE PEOPLE Largest 10% of adults 210-273 lbs Large back sleeper heatmap Avg Pressure: mmHg - Area: inches2 Large side sleeper heatmap Avg Pressure: mmHg - Area: inches2
AVERAGE PEOPLE Middle 50% of adults 134-218 lbs Average back sleeper heatmap Avg Pressure: mmHg - Area: inches2 Average side sleeper heatmap Avg Pressure: mmHg - Area: inches2
PETITE PEOPLE Smallest 10% of adults 111-135 lbs Petite back sleeper heatmap Avg Pressure: mmHg - Area: inches2 Petite side sleeper heatmap Avg Pressure: mmHg - Area: inches2
BACK SLEEPER
LARGE PEOPLE Largest 10% of adults 210-273 lbs Large back sleeper heatmap Avg Pressure: mmHg - Area: inches2
AVERAGE PEOPLE Middle 50% of adults 134-218 lbs Average back sleeper heatmap Avg Pressure: mmHg - Area: inches2
PETITE PEOPLE Smallest 10% of adults 111-135 lbs Petite back sleeper heatmap Avg Pressure: mmHg - Area: inches2
SIDE SLEEPER
LARGE PEOPLE Largest 10% of adults 210-273 lbs Large side sleeper heatmap Avg Pressure: mmHg - Area: inches2
AVERAGE PEOPLE Middle 50% of adults 134-218 lbs Average side sleeper heatmap Avg Pressure: mmHg - Area: inches2
PETITE PEOPLE Smallest 10% of adults 111-135 lbs Petite side sleeper heatmap Avg Pressure: mmHg - Area: inches2

The Main Beautyrest Black K-Class Medium Features in Detail

Beautyrest Black K Class Medium Mattress

  1. 1. BlackICE 4.0

    Like all Beautyrest Black models, this mattress has a top layer of BlackICE 4.0 to help it remove excess body heat.  It's cool to the touch so you can feel the coolness.

  2. 2. RightTemp Memory Foam

    This layer of foam is conforming and cooling to bring even more of the important features to the bed.

  3. 3. Nano Coils

    There is a layer of short, soft coils to also provide additional contouring and conforming support.  It works in tandem with the other foam layers.

  4. 4. Gel Memory Memory Foam

    In the K-Class only this model has Gel Memory Foam - a premium cooling and conforming foam material.

  5. 5. T3 Pocketed Pocketed Coil Technology

    The core of the mattress is the T3 Pocketed Coil innerspring.  It provides variable pressure relief with a softer feel at the top that increases in firmness as more weight it added.  

Comfort Depth Video

We measured how far your hips and shoulders sink into the Black K-Class Medium mattress with different body types.

Jed's Comfort View - Coming Soon

Jill's Comfort View 

Andrew's Comfort View 

Warranty

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

Conclusion

The K-Class Medium mattress will be a very good bed.  It's part of the top 3 beds from Beautyrest, but it's not as tall, has a medium feel, and is less expensive than the other 2 models.

The Medium has the same main features as all of the beds in the K-Class lineup:  It has a layer of Nano coils, RightTemp Memory foam, and BlackICE 4.0 cooling material.  It also has its own layer of Gel Memory Foam.  It's 14 1/2 inches tall so it's not too high in a bedroom.

Beautyrest designed this mattress to appeal to the majority of sleepers, and in our comfort ratings it's a 5 out of 10 (1 being firm and 10 being soft) so you can see it's right in the middle in terms of comfort.  It will appeal to most people unless you happen to like a very firm or very soft mattress.  So for most people, the real decision is around the price and the features included.  If you're looking for an upper-end mattress with these features then this bed is one to consider. You might also consider the firm and plush option for this collection. 

See the bed

Beautyrest Black K-Class Medium Specifications:

Product Name
Queen Price

$3,899

Brand
Beautyrest Black
Mattress Comfort
Medium
Comfort Scale Number
5
Coil Count
1000
Coil Gauge
14.7/17
Height
14.5"
Comfort Padding Layers
  • 1/2" Plush Comfort Foam 
  • 1" Medium Comfort Foam 
  • 1" RightTemp™ Memory Foam 
  • 1" 2K Nano Coils 
  • 1" Beautyrest® Gel
Warranty
  • 10-year warranty against manufacturer's defects
  • No Flip, No Rotate
  • Non-prorated
Back Support System
  • T3 Pocketed Coil Technology
Quilt Top of Mattress
  • BlackICE 4.0
Edge Support
  • yes
Recommended For Side Sleepers Who Weigh
  • coming soon
Recommended For Back Sleepers Who Weigh
  • coming soon

About The Author Joe Nashif

A jack of all trades in the mattress industry, Joe is a merchandiser who’s seen the changes in the products and trends for many years. Active in Brazilian Jui Jitsu, along with related injuries, he enjoys resting at home with family, too.