Serta iComfort CF4000 Firm Mattress Review

Updated January 9, 2023

The iComfort CF4000 Hybrid Firm mattress is the top-of-the-line firm model in the newest iComfort collection from Serta. 

Comfort Scale Rating

The CF4000 Hybrid Firm mattress is expected to be a medium-firm comfort rated a 3 on our 10 point Comfort Scale (a 1 is hard, 10 is softest.) A mattress with this comfort will work nicely for people who like a firmer feel, without it being too hard. If you don't like firm, try the plush option.  

Pros & Cons

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Pressure Test Results

We'll pressure test the iComfort CF4000 Hybrid Firm mattress with small, average, and large body size people on their sides and on their back sleeping positions to see what kind of support and pressure relief you can expect. (Learn how we test.)  

Our expectations for this mattress are that it will perform very well for back sleepers but not so well for side sleepers.  People who sleep on their sides often experience an excess of pressure on their shoulders and hips while laying on a firmer feeling mattress.  

Until we've completed our testing of the CF4000 Hybrid Firm you can use the sample image below as an idea of what a firmer mattress with memory foam like this will perform.  Come back soon for updated information!

Personalized Recommendations - Learn More »

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

	Petite	Average	Large
Back Sleeper
Side Sleeper

• Recommended
• Good
• Not Recommended

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

	BACK SLEEPER
LARGE PEOPLE Largest 10% of adults 210-273 lbs	Avg Pressure: mmHg - Area: inches2
AVERAGE PEOPLE Middle 50% of adults 134-218 lbs	Avg Pressure: mmHg - Area: inches2
PETITE PEOPLE Smallest 10% of adults 111-135 lbs	Avg Pressure: mmHg - Area: inches2

	SIDE SLEEPER
LARGE PEOPLE Largest 10% of adults 210-273 lbs	Avg Pressure: mmHg - Area: inches2
AVERAGE PEOPLE Middle 50% of adults 134-218 lbs	Avg Pressure: mmHg - Area: inches2
PETITE PEOPLE Smallest 10% of adults 111-135 lbs	Avg Pressure: mmHg - Area: inches2

Details of the Layers Within the iComfort CF4000 Hybrid Firm

1. 1. 1025 iComfort Hybrid Support™ System

   In this advanced innerspring system, individually wrapped coils work independently to conform to every curve of your body and provide durable support.

2. 2. Air Support™ Foam

   This exclusive air-cushion technology moves with your body and smartly contours around it to help alleviate aches and pains caused by pressure points.

3. 3. Serta Balanced Support Foam

   This layer of foam cradles your body which enhances that hug-like feeling you get from memory foam and provides supportive comfort. 

4. 4. Max Cold™ Cover

   This cool-to-the-touch cover helps reduce your body temperature for ideal sleeping comfort. It helps you to fall asleep faster and stay asleep longer.

Warranty

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

Serta iComfort CF4000 Hybrid Firm Specifications:

About the Author, Dave Higgins, Mattress Expert

Dave has worked in the furniture business, focusing on mattresses, for several years. His focus on mattress industry trends and developments has led to a deeper understanding of how people sleep and how they perceive comfort.