Serta iComfort CF4000 Plush Mattress Review

Updated November 5, 2022

Serta iComfort CF4000 Plush Mattress

The iComfort CF4000 Plush mattress is the top-of-the-line soft mattress in the iComfort collection, 'CF' models. This bed is packed with features like memory foam, and cooling technology and it comes highly recommended for back sleepers. Please continue reading our expert review to view test results, features, and more:

Comfort Scale Rating

The CF4000 Plush mattress rates as a soft comfort that we rate 7 on our 10 point Comfort Scale (a 1 is hard, 10 is softest). If you're researching this model because you prefer a softer bed with premium features, then this model is a great choice. If you think that a firmer comfort might work better for you then there are several other 'CF' models in the iComfort collection that might be a better choice.

iComfort CF4000 Plush Expert Video Review

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

Pros & Cons

PROS CONS
  • Great support and contouring, tested well 
  • Three snowflakes mean multiple layers of cooling technology
  • Premium materials including EverCool® Fuze Gel Memory Foam 
  • Serta has been making beds since 1931, a very popular and trusted brand
  • Great for people who like soft support
  • A softer-feeling mattress might be uncomfortable for anyone who prefers a firmer-feeling bed  
  • All foam mattress with no coils for added support
  • Not available in twin or full-size

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Pressure Test Results

We've pressure tested the iComfort CF4000 Plush mattress with small, average, and large body size people who sleep on their sides and backs to see what kind of support and pressure relief you can expect. (Learn how we test.)  

This mattress performed particularly well for back sleepers, providing excellent back support and pressure relief for great comfort and the promotion of quality REM sleep. It did, however, earn one 'not recommended' score for the large-sized side sleepers which can be attributed, in part, to the excessive amount of pressure that is shown on the shoulders and hips in the image below.

The bright red areas exhibit an area where the pressure was far too much which would lead to tossing and turning for very interrupted sleep. The yellow areas mean there's an increase in the amount of pressure, above what is considered 'normal, or acceptable. The green and light blue areas are what you want to see, they show where the body is getting good pressure relief and proper back support. As you can see in the back sleeper images, this bed does a very good job of supporting the lower back for proper spinal alignment.

In considering this mattress for your next bed purchase, feel free to use our test results in your decision-making:

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 CF4000 Plush Features in Detail

iComfort CF4000 Plush Cutaway Image
  1. 1. Max Cool Cover

    This cover gives you an instant cool-to-the-touch sensation. It's made from high-performance fibers and aids in getting you to sleep faster. 

  2. 2. Carbon Fiber Memory Foam

    A first-of-its-kind memory foam layer infused with carbon fiber for cooling as well as strength and resiliency. This system channels heat away from your body and it also provides exceptional strength for back and neck support.

  3. 3. 3” EverCool® Supreme Memory Foam

    A layer of Serta's EverCool® Supreme Memory Foam for cradling comfort helps relieve pressure points with a soft, yet supportive feel. This foam is another layer of cooling technology to remove excess heat away from your body.

  4. 4. Ultra-Cool Phase Change Material

    Phase Change Material creates a layer of extra-cool Carbon Fiber Memory Foam that provides a cooler sleep surface to help you fall asleep faster. It provides exceptional pressure point relief to reduce tossing and turning and promote deeper REM sleep.

  5. 5. Air Support™ Foam 

    Serta's exclusive air-cushion technology in this foam layer moves with your body and smartly contours around it to help soothe pressure points and alleviate aches and pains

  6. 6. Serta Foam Core

    The core foam upon which the other foam layers rest. This foam is the firm part of the bed, it's the foundation for the comfort layers in the top part of the bed.


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Comfort Depth Video

We measured how far your hips and shoulders sink into the CF4000 Plush mattress with different body types.

Aaron's Comfort View

Richard's Comfort View

Andrew's Comfort View

Warranty

The iComfort CF4000 Plush mattress comes with a 10-year warranty against factory defects.

More about Serta

Serta was founded in 1931and has been based in Illinois ever since. Serta first released their iComfort mattress in 2011. Since being founded, Serta has delivered multiple industry firsts and has provided quality mattresses all over the world.

Conclusion

At the top end of the iComfort collection in the 'CF' models are the CF4000s, of which there are two models. The CF4000 Plush is the softer-feeling bed of the two and represents the greatest number of comfort layers and cooling technology out of all six 'CF' model beds.  A visual cue that this bed is loaded with cooling technology is the three snowflakes that are sewn into the bed cover at the foot of the bed.

Just like all the other 'CF' models, the CF4000 Plush has a layer of Carbon Fiber Memory Foam, part of its UltraCold System™. This system works to absorb excess heat and expel it away from your body for a more comfortable night's sleep. Serta also introduced its exclusive Air Support™ Foam, which gives you excellent body contouring support. 

Not only do these foams work to draw heat away from your body, but they also serve their primary function, making sure you're comfortable throughout the night. Fortunately, this mattress tested exceptionally well for back sleepers during our pressure testing. It's not quite as effective for side sleepers though, so bear that in mind when you're considering this mattress.  

Being at the top-end of the 'CF' models means that the CF4000 Plush comes with a hefty price tag. Like many other people on a budget, I couldn't afford this bed if I tried, but, if money is no object and you want the top-end all-foam bed that's a softer feeling mattress, this bed is a perfect choice. If you're on a budget, but want a quality memory foam mattress, you might want to consider one of the cheaper models in the iComfort line.


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Serta iComfort CF4000 Plush Specifications:

Product Name
iComfort CF4000 Plush Mattress
Price
Brand
Serta
Mattress Comfort
Plush
Comfort Scale Number
7
Coil Count
None
Coil Gauge
N/A
Height
13.5"
Comfort Padding Layers
Warranty
  • 10-year warranty against manufacturer's defects
  • No Flip, No Rotate
  • Non-prorated
Back Support System
  • EverCool® Supreme Memory Foam
  • Serta Foam Core
Quilt Top of Mattress
Edge Support
  • yes
Recommended For Side Sleepers Who Weigh
  • 134-218 lbs
  • 111-135 lbs
Recommended For Back Sleepers Who Weigh
  • 210-273 lbs
  • 134-218 lbs
  • 111-135 lbs

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About the Author, Dave Higgins

Dave has worked in the furniture business, focusing on mattresses, for several years.  He enjoys oil painting in the Impressionist style, playing guitar, and cooking for his family.  Dave also believes that English Bulldogs are the comedians of the canine world.