Comfort Tech Serene Review

In This Review
Performance Tests | Firmness | Support & Sleeping Positions | Design | Materials | Comparisons | FAQs

At NapLab, we put each mattress to the test.

We test 10 different factors that impact the performance, comfort, and feel of the mattress. We then take the results of those tests and compare them to every mattress we’ve tested to date.

Check out the full performance table below to see how this mattress ranks:

Factor	Comfort Tech Serene	Average
Overall Score	7.83	8.51
Price (Queen)	$350	$1,037 (Memory Foam only)
Cooling – Score	8.0	8.6
Sinkage – Depth	2.30″	2.25″
Sinkage – Feel	Deep	Moderate
Motion Transfer – Score	7.8	8.2
Motion Transfer – Acceleration	9.86 m/s²	8.84 m/s²
Response Time – Score	8.7	8.8
Response Time – Mostly Recovered	0.4 sec.	0.4 sec.
Response Time – Fully Recovered	0.8 sec.	1.0 sec.
Bounce – Height	3.77″	8.72″
Bounce – Feel	Extremely Low	Moderate
Edge Support – Score	6.9	8.7
Edge Support – Sitting	4.00″	3.90″
Edge Support – Lying	Poor	Good
Sex – Score	6.3	8.2
Pressure Relief – Score	8.0	8.6
Comfort Layer Thickness	4.00″	4.32″
Mattress Thickness	10.00″	12.24″
Off-Gassing – Score	6.1	8.0
Off-Gassing – Smell	Strong	Strong
Off-Gassing – Days	14 days	7 days
Company – Score	9.6	8.8
Trial	365 nights	187 nights
Warranty	10 years	40% have lifetime warranties, average of other 60% of mattresses is 13 years

How is Comfort Tech Serene Different?

The Comfort Tech Serene is a 10.00″ memory foam mattress with an overall performance level that is below average, but also a below-average price. Compared to the average, the Serene is 66% less expensive, for a savings of $687 off the average price.

Advantages

Aside from the low price, the only other redeeming advantage of the Comfort Tech Serene is the favorable return policy that Costco offers, with a “100% Satisfaction Guarantee”.

Neutral Factors

This mattress has deep sinkage and extremely low bounce. Both sinkage and bounce are considered neutral factors, as different sleepers will have different preferences.

But you’ll need to enjoy a more dramatic contour if you want to enjoy the Serene mattress.

Disadvantages

Disadvantages of this mattress include worse cooling performance, higher levels of motion transfer, and a slightly slower response time.

Edge support is disappointing as well, and when paired with low bounce, the mattress has a lower sex score and intimacy pays the price.

In our tests, the mattress took 14 days to stop smelling, which is 2X longer than the average off-gassing duration.

The Comfort Tech Serene has good cooling. During our tests, I felt a slight level of heat retention around my body, but fortunately, it was nothing extreme or overly hot.

This mattress is an all-foam design with layers of poly foam (Serene foam) and memory foam. While the use of a thin cover and Serene foam (a more advanced, breathable poly foam) as the topmost comfort layer helps, they alone aren’t enough to push this into the excellent or outstanding level of cooling performance.

• Baseline Temperature – the temperature of the mattress before anyone lies on it
• Maximum Temperature (0 minute) – the temperature of the mattress after lying on it for 15 minutes
• Ending Temperature (5 minute) – the temperature of the mattress after being lied upon and having no one on it for 5 minutes

In my view, the all-foam design and memory foam layer within the core are limiting airflow, which creates more heat retention. In our objective temperature tests, we measured a max surface level temperature of 90.3° F.

This is 0.2° warmer than the average of 90.1° F, based on all of our tests to date. After getting off the mattress, the temperature declined by 4.5 degrees from minutes 0 to 1, which is 0.3 degrees warmer than the average 0 to 1 minute decline of 4.8 degrees.

When we consider the combination of objective data, my subjective experiences, and an analysis of the materials, I’m confident in my view that cooling is good.

The Comfort Tech Serene has deep sinkage. During our tests, we measured a pressure point sinkage depth of 2.30″. This is 0.05″ more sinkage than the average sinkage depth of 2.25″, based on all of our tests to date.

The level of sinkage is documented in the image below.

The mattress creates a dramatic body contouring hug. While this mattress does use a more advanced poly foam within the topmost layer, the total feel of the mattress still has the classic memory foam feel.

We have lots of hug and a more exacting contour around the precise shape of your body. These feel attributes, combined with the deeper sinkage, create a more enveloping feel that some sleepers may find is harder to move around on and change positions.

In my view, in order to find this mattress comfortable, you’ll want to prefer the feel of memory foam with lots of hug around the body.

The Comfort Tech Serene has a moderate level of motion transfer. During our tests, we measured a total acceleration range of 9.86 m/s². This is 12% more motion transfer than the average of 8.84 m/s².

Typically, all-foam mattresses, especially those that utilize more memory foam, perform better than average for motion transfer. However, that’s not what we measured here.

Based on my analysis of the data, it seems that the taut cover is responsible for the increase in motion. Taut and tighter covers can be problematic for motion, as movements on one side of the mattress can cause the cover to abruptly pull to the other side of the mattress.

The level of motion transfer is also documented in the video below.

Fortunately, this increase in motion is short-lived, and yet, it’s something that we often see in mattresses that utilize thin, taut covers.

In our motion transfer chart, which visualizes our accelerometer data, we can see the highest motion peaks from 0 to 0.2 seconds. Motion declines dramatically immediately thereafter. By 0.63 seconds, we’ve returned to near-zero levels of energy, which is 0.26 seconds shorter than the average motion duration of 0.89 seconds.

The silver lining is certainly motion duration, which is considerably better than average. Even so, motion intensity is worse than average, and that could be problematic for some sleepers.

The Comfort Tech Serene has a fast material response. In our mostly recovered test, we measured a recovery speed of 0.4 seconds, which is 0.01 seconds faster than the average of 0.41 seconds, based on all of our tests to date.

In our fully recovered responsiveness test, we measured a recovery speed of 0.8 seconds, which is 0.22 seconds faster than the average of 1.02 seconds.

The level of responsiveness is documented in the video below.

This mattress uses a 2.0” poly foam in the topmost layer called Serene foam. This foam is highly responsive and springs back to shape quickly. However, we also have a 2.0” memory foam layer within the core. This memory foam layer is slower to fully recover back to its original shape.

Even so, while the memory foam layers slows the total mattress recovery speed down, it’s still faster than average. This recovery speed helps improve ease of movement on the mattress.

The Comfort Tech Serene has an extremely low level of bounce. During our tests, we measured a total bounce height of 3.77″. This is 4.96″ less bounce than the average of 8.73″, based on all of our tests to date.

The combination of an all-foam design that includes a 2.0” layer of memory foam within the core sets the stage for a low-level bounce. Foam simply doesn’t return as much energy as coils, and that is doubly true of both memory foam and Serene foam.

The level of bounce is also documented in the video below.

The lower bounce is a major reason why motion transfer is kept to a reasonably low level. That said, less bounce does negatively impact ease of movement and makes sex performance considerably worse. As such, there are pros and cons to consider with bounce.

The Comfort Tech Serene has good sitting edge support and poor lying edge support.

In our sitting edge support test, we measured a sitting sinkage compression of 4.00″. This is 0.10″ more sitting sinkage than the average of 3.90″, based on all of our tests to date.

The level of edge support while seated is documented in the images below.

While lying directly on the edge of the mattress, I felt that the support was poor in all sleeping positions. The problem with the lying edge support is the memory foam comfort layer.

Memory foam, by its nature, creates a more dramatic hug around the body. While in the middle of the mattress, that hug creates great comfort and pressure relief.

The level of edge support while lying is documented in the images below.

However, that hug along the edge creates a weakening of support, as there simply isn’t enough material to wrap around the body nearest the absolute edge. Notably, this mattress does not utilize any type of reinforced edge support materials.

The lack of a reinforced edge, in addition to the problematic nature of memory foam, creates less-than-great edge support. Overall, I found lying edge support to be incredibly disappointing. There just isn’t enough support to sleep near the edge, in my view.

The Comfort Tech Serene has mediocre sex performance. On the positive side, noise is minimal and both pressure relief and cooling is good.

Edge support also earned a good score, at least for sitting, where we measured sitting sinkage compression at 4.00”. While 4 of our 5 sex testing areas earned good scores, the Comfort Tech’s bounce just was really low. We measured bounce at just 3.77”.

Sex Factor	Factor Weight	Score	Rating
Bounce	65%	5.0	Very Low
Edge Support	20%	8.8	Good
Noise	5%	10	Minimal
Pressure Relief	5%	8.0	Good
Cooling	5%	8.0	Good

This is massively lower than average. A mattress with less bounce is more strenuous and more tiring for sex, as it simply absorbs more of your amorous energies.

In general, more bounce is almost always better for sex than less. The lack of bounce makes this mattress considerably worse for sex than the average mattress.

The Comfort Tech Serene has a good level of pressure relief. During our tests, I felt no significant pressure points on my body.

The mattress is equipped with 4.0″ of comfort material, which is 0.32″ less comfort material than the average comfort layer thickness of 4.32″, based on all of our tests to date.

In all NapLab mattress tests, we make it a point to cut the mattress open to examine the material quality. The topmost foam, which is a layer of Serene foam (a type of poly foam), looks and feels excellent, both on the body and in-hand.

We’ve tested Serene foam in other mattresses and have almost always been pleased with the performance, feel, and quality.

The memory foam layer within the core of the mattress is far less impressive. I would describe the foam quality as being fine, but also far from great.

This mattress utilizes a thin, knit cover that lets the body come into more immediate and direct contact with the foam layers. It’s this feel that creates a more dramatic body contouring hug and really allows you to feel that memory foam experience.

The combination of the thin cover, deep sinkage, all-foam design, and memory foam core creates the classic memory foam feel, which means lots of hug and contour. In our objective pressure mapping tests, we measured a max PSI of 0.41. This is well within the 1.0 PSI threshold I want to see.

Pressure Relief (PSI)	Average	Maximum
Side Sleepers	0.08	0.31

Pressure Relief (PSI)	Average	Maximum
Back Sleepers	0.06	0.41

Pressure Relief (PSI)	Average	Maximum
Stomach Sleepers	0.05	0.25

When I consider our objective pressure mapping tests, material thickness, material quality, and my subjective experience on the mattress, I’m confident most sleepers will find the pressure relief to be good.

The Comfort Tech Serene had a strong smell upon the initial unboxing. The mattress smelled for 14 days. This is 6.7 days longer than the average smell duration of 7.3 days.

Comfort Tech mattresses come with a 365-night trial period and a 10-year warranty. Shipping and returns are both free.

Company Factor	Factor Weight	Score	Data
Returns	40%	10	$0
Trial Period	30%	10	365 nights
Warranty	20%	8.0	10 years
Shipping	10%	10	$0
Country of Origin	0%		USA

Comparing 110+ brands tested to date, the average trial period is 180 nights and the average warranty is 13 years. Note, this excludes the 41% of mattresses that offer lifetime warranties.

Costco mattresses are backed by a “100% Satisfaction Guarantee” policy. Under these terms, mattresses can be returned virtually any time after purchase for a full refund, assuming the mattress is in usable condition (ie: no tears, major stains, or water damage).

While Costco doesn’t call it a “trial period”, in my view, this is functionally the same as a trial period, since you’re able to return the mattress for essentially any reason and get a full refund. While Costco’s return policy doesn’t have a hard limit, we’ve listed it as 365 nights (this is the max we’ve seen other brands offer and also means it earns a 10/10 trial period score).

The Comfort Tech Serene is available in two firmness options—Medium and Firm. We tested the Medium version and I found the mattress to have a medium-firm feel. This is a 6 out of 10, where 10 is the most firm on our firmness scale.

I would estimate the Firm version to be closer to an 8 out of 10, with a firm feel, as the brand describes.

Support on the Comfort Tech Serene is good. During our tests, I felt well supported in all sleeping positions. The mattress is equipped with a 6.0″ support layer. This is 1.91″ thinner than the average support layer thickness of 7.91″, based on all of our tests to date.

Support Factor	Data
Comfort Layer	4.00″
Support Layer	6.00″
Firmness	Medium-Firm
Body Contour	Dramatic
Zoned Support	No
Reinforced Edge	No

For a mattress to create ideal support, it must both support the body, creating a neutral spinal alignment, while also creating sufficient comfort. The Comfort Tech Serene achieves both of those requirements.

To be fair, this mattress isn’t a support miracle worker, but given the price point, it provides a better level of support than I expected.

Check out the table below to see the sleeper weights and sleeping positions that would be best suited for this mattress.

Sleeper Weight	Stomach Sleeper	Side Sleeper	Back Sleeper
Under 150 lbs.	Yes	Yes	Yes
150-250 lbs.	Yes	Yes	Yes
250-300 lbs.	Yes	Yes	Yes

This mattress has a medium-firm feel, which is ideal for most body types and sleeping positions. Notably, there is no zoned support on this mattress. Instead, we have a consistent level of firmness and support from head to foot of the mattress.

In my view, whether or not you feel well supported by this mattress will come down to whether or not you like the feel of memory foam. This mattress has lots of hug, lots of sinkage, and lots of contour. This comfort dynamic creates a more polarizing feel and simply isn’t a great fit for all sleepers.

You’ll need to strongly prefer the feel of memory foam to feel well supported by this mattress.

Based on all of my tests to date, an analysis of the materials, and my subjective experiences, I’m confident that most sleepers will find support on the Comfort Tech Serene to be good.

The Comfort Tech Serene is a Costco-exclusive 10.00″ memory foam mattress that’s available in a medium-firm or firm feel. It a budget-friendly, all-foam mattress designed for sleepers who don’t want to overspend.

The Serene is also offered in an RV-sized mattress, which could be advantageous for sleepers looking for that specific size.

Design Factor	Data
Type	Memory Foam
Thickness	10.00″
Cover Type	Thin
Weight	45 lbs.
Has Handles	No
Fiberglass-Free	Yes
Ships in a Box	Yes

The Comfort Tech Serene is 10.00″ thick and contains a combination of different foam types. From top to bottom, here is a full list of the materials used in this mattress:

Layer Type	Thickness	Layer Specs
Poly Foam	2.00″	Not Available
Memory Foam	2.00″	Not Available
Support Foam	6.00″	Not Available

The Comfort Tech Serene has a thin cover that is soft and stretchy. The top cover is white and slightly wraps the perimeter of the mattress before transitioning to a navy blue cover on the side of the mattress.

The navy blue fabric is thicker and more durable for better longevity. There are no handles on the sides of the mattress.

The comfort layer is 4.00″ thick and made of two layers of foam. Directly below the cover is a 2.0″ poly foam (blue foam) followed by a 2.0″ memory foam (white foam).

Despite not having memory foam as the top layer of this mattress, the Serene still has a classic memory foam feel to it, marked by lower levels of bounce and deeper contour.

The support layer is 6.00″ thick and made of a single 6.0″ support foam. For a 10″ all-foam mattress, this is exactly the support layer I’d expect to see.

Product Evolution

The Comfort Tech Serene mattress appears to have been around for many years, with third party reviews dating back as early as 2017. This specific model appears to have been added to Costco’s lineup in 2023.

It is unclear the exact changes that have been mode to the Serene model over the years. However, at least for the specific model sold at Costco, there do not appear to have been any major changes since it first became available in 2023.

Other Mattresses to Consider

Not sure if the Comfort Tech Serene is the right pick for you? Check out these three other top-rated memory foam mattresses for alternatives under $700 you may want to consider.

Frequently Asked Questions

Still have questions? Check out some of the top FAQs on the Comfort Tech Serene mattress below and get the answers you’re looking for.