Serta iComfort CF4000 Firm Mattress Review

Updated January 9, 2023

The iComfort CF4000 Firm mattress is the top-of-the-line firm model in the CF iComfort collection. It’s one of 6 beds available in their iComfort collection and it’s highly rated, as our test results confirmed.

Comfort Scale Rating

The CF4000 Firm mattress is a medium comfort that we rate a 5 on our 10 point Comfort Scale (a 1 is hard, 10 is softest.) This mattress comfort will appeal to most people because it’s not too hard or too soft, despite it being named a 'Firm'. This is really rather a medium-feeling bed based on our comfort testing which is a great feel for most people. If your preference is for a very firm or very soft bed, check out one of the other mattresses in the iComfort collection. 

iComfort CF4000 Firm Expert Video Review

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

Pros & Cons

PROS	CONS
Tested well demonstrating great support and contouring Minimal motion transfer, you'll likely not feel your sleep partner's movements  Well recommended for pressure relief and back support Medium comfort appeals to most people Premium materials including Air Support™ Foam  Serta is a very popular Trusted Brand, in business since 1931	Medium comfort may not be ideal for those looking for a very soft or a very firm feeling bed  All foam mattress, no coils for added support if that is your preference Not available in Twin or Full sizes Not recommended for larger-sized side sleepers

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Pressure Test Results

We've pressure tested the iComfort CF4000 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.)  

For an all-foam mattress, this model performed very well, earning four out of six 'recommended' scores for its outstanding pressure relief and fantastic back support. Both the pressure relief and backs support a bed gives you are extremely necessary for good quality sleep. Too much pressure causes tossing and turning, while a lack of back support can cause stiffness and pain. Both lead to disturbed, uncomfortable sleep, which is detrimental for your body and mind.

When you consider these test result images keep an eye out for green areas where the pressure relief in the mattress is doing its job. The yellow areas show an increase in pressure and the red areas show where there's too much pressure.  

The CF4000 Firm Features in Detail

1. 1. Cool Touch Cover

   The cover for this mattress is cool-to-touch which gives you a cooler feeling to help you drift off to sleep. This is the first layer of several that works to provide you with a temperature-neutral sleep environment.

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 provides exceptional strength for back and neck support.

3. 3. Deep Reaction™ Max Memory Foam

   This layer of Deep Reaction™ Max Memory Foam enhances the bed's heat dissipation and further enhances the overall comfort and support this bed offers. 

4. 4. Air Support™ Foam

   The 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.

5. 5. Serta Foam Core

   The core foam upon which the rest of the foam layers rests. This foam is the firm part of the bed, it's the foundation for the comfort materials in the top part of the bed which also gives you conforming support. 

Comfort Depth Video

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

Warranty

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

Serta iComfort CF4000 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.