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Serta iComfort Blue 100 Mattress Review

I’m super excited about this review because I’ll be taking a look at the iComfort Blue 100 mattress from industry vet Serta. This is one of several iComfort models from the brand and features an all-foam construction designed to offer sleepers a “Gentle Firm” feel.

While Serta may have a strong reputation in the bedding world, I’m not going to let the company rest on its laurels; instead, I’m going to put this bed to the test to figure out how it sleeps, how it feels, and whether or not it could be the perfect mattress for you!

Continue reading below for my full review of the Serta iComfort Blue 100 mattress. Don’t have time to read it all? Click here to skip to the bottom and check out my review summary.

Serta iComfort 100 Mattress
Serta iComfort 100 Mattress

The iComfort Blue is a super soft bed ideal for side sleepers who need a lot of body contouring and pressure relief. 


As I mentioned up top, the Serta iComfort Blue 100 is one of several mattresses in the brand’s iComfort line, which features five other all-foam models as well as a fleet of hybrid beds. The Blue 100 itself is built with four layers of both memory foam and high-density poly foam, which creates an interesting interplay between pressure relief and support.

While the iComfort line offers a wide range of firmness levels for different kinds of sleepers, the Blue 100 has been designed specifically with a “Gentle Firm” feel in mind.

I’ll explore more what that means later, but for now let’s dive into the bed’s different layers.

Cover – The cover is comprised of a thick material that has a pleasant, cozy feel to it. It’s also fairly stretchy, so it shouldn’t bunch up as you toss and turn in the night.

Serta iComfort Blue 100 Cover
Taking a look at the cover of the Serta iComfort Blue 100

Comfort Layer – Built with .75” of TempActiv gel memory foam, the comfort layer has a slow response to pressure, which should allow the sleeper to sink in for some satisfying relief. And while memory foam has a bit of a reputation for overheating, Serta’s managed to mitigate this with a special gel infusion that works to keep things cool through the night.

Contour Layer – The sinkage of the comfort layer is extended deeper into the mattress thanks to an additional 2” section of memory foam. As with the foam above it, the material here contours snuggly to the shoulders and hips as the sleeper sinks into the bed. Again, you’ll notice a gel infusion in the foam here that helps to regulate the absorption of body heat.

Transition Layer – Next up you’ll encounter a 1” layer of poly foam, included to help transition the sleeper from the softer foam layers up top into the firmer base below.

Support Layer – Composed of a thick, 6” layer of high-density poly foam, the base of the bed brings some much needed support and stability to the structure. It functions primarily to give the softer layers something off of which to respond and to help the mattress feel more secure.

Serta iComfort Blue 100 Construction
Showing the layers of the Serta iComfort Blue 100


After taking a look at the construction of the Blue 100, let’s chat about the firmness and feel. I started off by applying light hand pressure to the mattress and found that I was immediately interacting with the gentle comfort layer. I could really feel my hand sinking into this material, with the foam contouring nicely to my hand. As I pushed in further, I continued to feel some fantastic pressure relief from the mattress.

Serta iComfort Blue 100 Hand Press
Pressing into the layers of the Serta iComfort Blue 100

Since folks of diverse sizes and body types are going to feel firmness differently, I decided to bring in three other testers to help me figure out how firm the Blue 100 mattress is. To do this, we each took a turn lying on the bed, gave it a personal firmness rating, and then compiled them together on the graph below.

While feel is always going to be an individual thing, our responses should give you a good sense of the firmness range you can expect from the mattress.

Serta iComfort Blue 100 Firmness
Firmness ratings for the Serta iComfort Blue 100 from four testers

There was a bit of variance among my testers, but we landed on an average firmness rating of 5.75. When compared to the industry standard of 6.5 for medium firmness, it’s clear that this bed is just a touch softer than medium firm.

I personally gave the Blue 100 a rating of 5, finding its layers of gentle memory foam to create an overall soft structure. While the high-density poly foam in the base does a pretty good job of supporting the layers above it, you’re still likely to feel as though you’re sleeping more “in” the mattress as opposed to “on top” of it.

Serta iComfort Blue 100 Contour
Showing how the Serta iComfort Blue 100 contoured to my body as I sank into the mattress

This feel could be especially well-suited for side sleepers, who will find a lot to love in the cushiony relief the double memory foam top layers provide to the shoulders and hips. Conversely, stomach sleepers may find that the lack of support produces some tension along the spine. For these sleepers, I’d recommend checking out the iComfort Blue 300, which is designated as the line’s “Firm” bed.

Serta iComfort 100 Mattress
Serta iComfort 100 Mattress

The iComfort Blue is a super soft bed ideal for side sleepers who need a lot of body contouring and pressure relief. 


Another important component of a bed’s feel is pressure, or more specifically where pressure points are likely to form while lying on top of it.

To help you visualize where these tension spots might crop up, I placed a pressure map on top of the mattress and lied on my back, side, and stomach. You can see the results on the image below where pressure is represented from blue (low pressure) to red (high pressure).

Serta iComfort Blue 100 Pressure Map
Showing the pressure map results from lying in multiple positions on the Serta iComfort Blue 100

Back – Lying on my back, my weight was evenly distributed across the surface. I could feel myself really sinking into the bed, with the soft foam materials doing a great job of contouring to my body and providing pressure relief to my lumbar region. As I attempted to move around and change positions, I did feel somewhat stuck in the mattress.

Serta iComfort Blue 100 Back
Lying on my back on the Serta iComfort Blue 100

Side – Rolling onto my side, I continued to feel great pressure relief from this mattress. Strict side sleepers tend to prefer softer mattresses that bring cushiony support to the shoulders and hips, and the Blue 100 definitely falls into this ideal “Gentle Firm” feel. Here, this softness is achieved with 3” of memory foam up top, engineered to envelop the sleeper in a comfortable embrace.

Serta iComfort Blue 100 Side
Lying on my side on the Serta iComfort Blue 100

Stomach – While the thick layers of memory foam in the comfort and contour layers could be great for side sleepers, they may not be as fantastic for stomach sleepers. As I turned onto my stomach, I found that the gentle foam caused my hips to sink out of alignment with my shoulders, which caused some discomfort along my spine. For this reason, I’d say that strict stomach sleepers may want to consider one of Serta’s firmer iComfort beds.


Now that we’ve gone over some of the finer points of the Blue 100, I thought it might be interesting to compare it to some of the other mattresses I’ve reviewed. While beds are always going to feature characteristics that make them distinct, it can often be useful to contextualize these specs against other models on the market.


Considering that Serta is one of the most well-known brands in the mattress world, it makes sense to compare it to another giant in the sphere: Casper. While the two companies may have different approaches to selling mattresses, their beds actually have quite a few similarities.

  • Foam Construction – Both the Casper and the Blue 100 feature all-foam constructions that combine pressure-relieving memory foam with supportive poly foam. While the Casper is definitely firmer than the Blue 100, the two mattresses offer the sleeper a pleasant, balanced foam vibe.
  • Cooling – Another big similarity between the two beds is that they both sleep cool. In the Blue 100, we see that in the gel infusions in the top memory foam layers. In the Casper, the temperature regulation comes from the bed’s top layer of proprietary foam.


It makes sense that we’d also give the Blue 100 a little side-by-side action with Purple, another popular bed-in-a-box brand on the market. Though the two beds appear to be wildly different, I actually think they share some interesting traits.

  • Side Sleepers – The Purple and the Blue 100 are both great mattresses for side sleepers as their gentle top layers provide targeted cushiony relief to the shoulders and hips.
  • Temperature Regulation – I’d also say that the two beds feature solid temperature regulation, thanks to the cooling gel infusion in the Blue 100 and the open cell hyper-elastic polymer grid in the Purple.
Serta iComfort 100 Mattress
Serta iComfort 100 Mattress

The iComfort Blue is a super soft bed ideal for side sleepers who need a lot of body contouring and pressure relief. 


Next up let’s take a look at motion transfer, or the amount of disturbance likely to be experienced across the surface of the mattress. This section will be important for everyone, but could be especially pertinent for couples as it’ll clue you into just how badly you’ll be bothered by your partner’s movements in the night.

To illustrate this motion transfer, I dropped a 10 lb. steel ball from heights of 4 inches, 8 inches and 12 inches and measured the disturbance it caused: the bigger the lines, the bigger the disturbance.

FYI: Each drop is meant to symbolize a different movement you’re likely to experience in bed, from tossing and turning (4”) to getting out of bed (8”) all the way to full on jumping (12”).

Serta iComfort Blue 100 Motion Transfer
Dropped a 10 lb steel ball from heights of 4, 8, and 12 inches to simulate motion in bed and check to see how much disturbance is transferred to the other side

Honestly, I’m kind of surprised by these high motion transfer results! I hypothesized that the thick layers of memory foam up top would do a better job of dampening movement across the structure, but this test shows that you’re likely to feel your partner tossing and turning in the night. What I would note is that the initial spikes in disturbance die down pretty quickly, which tells me that you shouldn’t be too bothered by these movements.


When buying a new bed, most people want to know whether they’ll feel like they’re sinking “into” the mattress or laying “on top” of it. To visualize this sinkage, I placed four balls of varying sizes and densities (a 6 lb medicine ball, a 10 lb steel ball, a 50 lb medicine ball, and a 100 lb medicine ball) on the mattress and measured how much they compressed the surface.

The variations in size, weight, and density are meant to simulate different body parts and different sized sleepers.

Serta iComfort Blue 100 Sinkage
Using four balls to simulate different body parts and check to see how far into the Serta iComfort Blue 100
  • 6 lb medicine ball: 1.5 inches of sinkage.
  • 10 lb steel ball: 2.25 inches of sinkage.
  • 50 lb medicine ball: 4 inches of sinkage.
  • 100 lb medicine ball: 6 inches of sinkage.

This is quite a lot of sinkage, which tells me that you’ll probably feel as though you’re sleeping in the bed as opposed to on top of it. You’ll notice the most dramatic dip at the 6 lb. and 10 lb. marker, indicating that you’re likely to experience the most body contouring within the first few minutes of lying on the bed as you dig into the memory foam top layers.


Serta iComfort Blue 100 Corner
The Serta iComfort Blue 100
  • Sleep Trial: 120 days.
  • Warranty: 10 years.
  • Shipping: Free Shipping and In Home Setup

Just getting started? Begin your mattress search with my mattress reviews breakdown.


If you’re convinced the Serta iComfort Blue 100 is the right mattress for you, the size and pricing information for the mattress are below. Please note that these prices reflect standard pricing, but coupons are often available.

Twin38" x 74.5" x 9.75"$659
Twin XL38" x 79.5" x 9.75"$749
Full53" x 74.5" x 9.75"$919
Queen60" x 79.5" x 9.75"$1,099
King76" x 69.5" x 9.75"$1,599
California King72" x 83.5 x 9.75"$1,599


Now that we’ve taken a closer look at the Blue 100 mattress, I want to highlight some of its biggest pros and cons:

Serta iComfort 100 Mattress
Serta iComfort 100 Mattress

The iComfort Blue is a super soft bed ideal for side sleepers who need a lot of body contouring and pressure relief. 


  • Side sleepers should find a lot to love in the Blue 100’s soft memory foam layers, which provide great pressure relief to the shoulders and hips.
  • The deep contouring of these layers is one of the standout features of the mattress and could be great for those sleepers who need to really sink into their bed.
  • Additionally, this is a very soft mattress, making it an excellent fit for anyone who wants a more plush vibe.


  • While a lot of sleepers will enjoy the gentleness of the all-foam construction, stomach sleepers may find that the design causes their hips to sink out of alignment with their shoulders.
  • I’d also note that there’s very little bounce to the Blue 100, which could be a detrator for anyone in search of buoyant support.
Serta iComfort Blue 100 Front
A queen size version of the Serta iComfort Blue 100
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Logan Block
Logan is the content director of Sleepopolis, which means he not only reviews new mattresses every week, but also curates all the comparisons, best of pages, and video guides on the site. He takes a straightforward, honest approach to his reviews and endeavors to give viewers an objective look at each new product he tries out. Logan has perfected his method by personally testing over 200 different mattresses, so he’s not only able to discern the overall vibe of a specific bed, but to contextualize its feel within the bed-in-a-box market as a whole. When he’s not hopping on a new bed or working with our editorial team to whip up an engaging sleep education guide, you can find him reading books on world history, walking his dog Pepper, or searching for the best cheeseburger in New York City.
Logan Block

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