Sealy Cocoon Chill 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 value of the mattress. Testing categories include:

Test	Rating
Cooling	Fair
Sinkage	Minimal
Motion Transfer	Moderate
Response Time	Slow
Bounce	Very Low
Edge Support	Excellent
Sex	Very Good
Pressure Relief	Fair
Off-Gassing	Very Poor
Company	Excellent

How is Sealy Cocoon Different?

The Sealy Cocoon Chill has a much lower overall performance score than the average score. The price is also lower—39% less than the average memory foam mattress.

Advantages

The mattress has a low price and good edge support, but those are the only notable advantages of the Cocoon.

Neutral Factors

Sinkage levels are just slightly less than average and the Cocoon Chill has low levels of bounce.

Disadvantages

The Sealy Cocoon Chill has worse cooling performance than average as well as higher levels of motion transfer, a slow material response time, and poor sex performance (thanks largely to low bounce levels).

The Sealy Cocoon is a 10″ mattress, thinner than average by 2.0″ (based on all of our tests), which both negatively impact support and pressure relief. Being a 10″ mattress alone doesn’t necessarily guarantee these types of issues, but the Cocoon also only has 2.0″ of comfort material, which is where the real problems come in.

Off-gassing is strong and very long at 41 and the trial is shorter than average. All in all, the disadvantages of the Sealy Cocoon Chill are more numerous than the positive aspects of this mattress.

Factor	Sealy Cocoon	Average
Overall	8.53	9.50
Price	$699	$1,133 (Memory Foam only)
Cooling	8.0	9.4
Max Sinkage	1.96″	2.17″
Total Motion Transfer	9.62 m/s²	8.51 m/s²
Response Time	2.5 sec.	0.4 sec.
Total Bounce	5.87″	9.57″
Edge Support – Sitting Sinkage	3.25″	4.10″
Mattress Thickness	10.0″	12.0″
Sex Overall	9.2	9.6
Comfort Material	2.0″	4.2″
Off-Gassing – Smell	Strong	Strong
Off-Gassing – Days	41 days	5 days
Trial	100 nights	162 nights
Warranty	10 years	25% have lifetime warranties, average of other 75% of mattresses is 14 years

The Sealy Cocoon Chill mattress has a fair level of cooling performance at best. During our tests, I felt a moderate to significant level of heat retention around my body.

The “chill” within the product name is seemingly the only cool thing about the Cocoon. The mattress is all foam with a memory foam comfort layer and no significant cooling features or materials.

• 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

All foam mattresses are almost always warmer than hybrid or other coil-based mattresses, as there is simply more material available in which heat could be retained.

According to Sealy, the mattress is equipped with a cooling phase change material within the cover.

However, in my experience on the mattress, this cover seemed to have very little, if any, impact. Even when I was lying with my bare skin directly on the cover I felt zero cooling sensation.

Heat Dissipation Over Time

In looking at our objective data, we measured a max surface level temperature of 89.4°F. After getting off the mattress the temperature declined by 4.5° from minutes 0 to 1, which is 0.08 warmer than average.

From minutes 0 to 5 the decline was 6.1°, which is 1.02° warmer than average.

Notably, Sealy also sells a hybrid version of the Cocoon, which I expect would be at least moderately better in terms of cooling performance. However, at least for this mattress, the cooling performance leaves much to be desired.

The Sealy Cocoon has a minimal level of sinkage. During our tests, we measured 1.96” of pressure point sinkage. This is 0.21” less sinkage than the average of 2.17”.

The level of sinkage is documented in the image below.

The Cocoon creates a traditional memory foam feel. There is a high degree of body contouring hug. The foam materials create an exacting hugging sensation around the specific shape of your body.

When you first lie down on the mattress it’s extremely hard. However, within a few seconds, it begins to contour and hug the body. The Cocoon has a slow material response.

This is one of the primary attributes of more traditional memory foam. To enjoy the Sealy Cocoon, you will absolutely need to love the feel of more traditional memory foam with its slower response and dramatic body contouring hug.

The Sealy Cocoon has a moderate level of motion transfer. In our tests, we measured an acceleration range of 9.62 m/s². This is 11.7% more motion transfer than the average of 8.61 m/s².

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

Motion is on the lower side, though not quite as low as we expected. In my view, the relative hardness of the mattress when you first lie down creates at least some portion of the increase in motion transfer.

The harder top surface creates a more rigid and firm surface for material rebound.

In our motion transfer chart, which visualizes our accelerometer data, we see motion peaks from 0 to 0.15 seconds. Motion declines notably immediately thereafter and by 0.64 seconds we return to near-zero levels of energy.

The average motion transfer for all memory foam mattresses we’ve tested to date is 5.31 m/s².

At 9.62 m/s² the Cocoon is significantly more. So while it won’t earn any awards for its motion transfer compared to other memory foams, compared to all mattress types, it is at a level that most should find sufficiently low.

The Sealy Cocoon has a slow level of material response. In our tests, we measured a mostly recovered material response time of 2.5 seconds and a fully recovered material response time of 4.0 seconds.

Both of these response times are significantly slower than the average times of 0.41 (mostly recovered) and 0.88 seconds (fully recovered), respectively.

The level of responsiveness is documented in the video below.

The Cocoon is built with traditional visco elastic foam, also known as memory foam. It’s this memory foam that takes a long time to contour to your body and a long time to reform back to shape when you move.

This slow response can make it more difficult to move around on the mattress and can cause many sleepers to feel “stuck” in the mattress.

The Sealy Cocoon is the 5th slowest responsiveness mattress out of the 199 mattresses we’ve tested to date (in both response test categories).

While there are certainly some sleepers who don’t mind and may even like the slow response, in our view, a majority of sleepers will find this level of response to be significantly off-putting. 

The Sealy Cocoon Chill has a very low level of bounce. In our tests, we measured a total bounce height of 5.87”. This is 3.70” less bounce than the average of 9.57”.

A lower level of bounce makes it more difficult to move around on the mattress and reduces sex performance. In general, I like to see 8-12” of total bounce.

Within this range, you can experience the greatest benefits of higher bounce, without it being so high as to create higher motion transfer. Suffice to say, at 5.87” the Cocoon is well below my ideal range.

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

The low bounce is what we would expect from a mattress built with these types of materials. The traditional memory foam greatly reduces energy and motion, which reduces bounce.

As with sinkage, contour, hug, and response, bounce is a situation where you will need to love the feel of traditional memory foam and everything that comes with it to feel comfortable on the Sealy Cocoon.

Edge support on the Sealy Cocoon Chill is a mixed bag with sitting edge support being excellent, but lying edge support was only fair at best.

In our sitting sinkage tests, we measured a sitting sinkage compression of 3.25”. This is 0.85” less sitting sinkage than the average of 4.10”. Ideally, I want to see 4.0” or less and the Cocoon exceeded that benchmark.

While sitting edge support was excellent the same cannot be said for lying edge support. During our tests, I did not feel well supported while lying directly on the edge of the mattress.

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

Like many other memory foam mattresses, the support feels quite squishy at the very edge of the mattress. The foam is trying to wrap and contour to the body, which when at the edge of the mattress creates a weakening of the support, as there just isn’t enough foam material to create full support.

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

This mattress lacks any type of reinforced perimeter edge support foam. This fact, combined with the relatively thin 10” profile, memory foam comfort layer, and relatively low-quality foam materials, creates the right environment for poor edge performance while lying.

Sex performance on the Sealy Cocoon is good, but far from great. The greatest detractor to sex performance is simply the level of bounce. At 5.87” the Cocoon’s bounce is well below average and within the “very low” range on our bounce scale.

The table below illustrates some of the most important factors for good sex on a mattress.

Sex Factor	Factor Weight	Score	Rating
Bounce	60%	9.0	Very Low
Edge Support	20%	9.9	Excellent
Noise	10%	10	Minimal
Pressure Relief	5%	8.0	Fair
Cooling	5%	8.0	Fair

For the Sealy Cocoon Chill, these individual factors generated a sex score of 9.2.

While the traditional memory foam may be great for reducing motion and dramatically hugging the body, those same performance attributes inhibit sex performance.

The best-performing mattresses for sex rebound energy at a high rate and naturally work with sex participants. In the case of the Cocoon, the mattress makes that natural bounce rhythm more strenuous, resulting in a level of sex performance that is well below average.

What Makes A Mattress Good For Sex?

The best mattresses for sex have high bounce, good edge support, quiet materials, and good pressure relief and cooling.

These 5 factors make up the NapLab sex performance score, as shown in the table above.

Pressure relief on the Sealy Cocoon is fair at best. During our tests, I felt a moderate level of pressure points on my lower back, mid back, and shoulders.

The mattress creates an inconsistent level of sinkage, with my butt sinking down further than my back and shoulders, creating improper alignment of my spine. The result was a pressure that gradually built up along my back.

When I look at the material design of the mattress the lack of pressure relief isn’t surprising. We have a mattress that’s only 10” thick and uses a thin 2.0” comfort layer.

On average, based on all of our tests to date, mattresses use 4.2” of comfort material. At just 2.0” of comfort foam the Cocoon Chill is far south of what we have found typically creates the best pressure relief. Overall, I found the Cocoon’s pressure relief to be disappointing.

Off-gassing on the Sealy Cocoon Chill mattress is quite strong and the mattress took 41 days to fully dissipate.

The average off-gassing duration is 5 days. So seeing Sealy at 41 days is certainly not where we want to be. If you’re sensitive to strong odors, this may be a bigger issue than it will be to other sleepers.

Sealy offers a 100-night trial period with a 10-year warranty. Shipping and returns are both free.

Compared to over 199+ other mattresses we’ve tested, this trial period is shorter than average (163-night average) as well as the warranty (14-year average, 25% of mattresses have lifetime warranties).

Company Factor	Factor Weight	Score	Data
Trial Period	25%	9.0	100 nights
Warranty	25%	10	10 years
Shipping	25%	10	$0
Returns	25%	10	$0
Country of Origin	0%		USA

For Sealy, these individual terms and conditions generated a company score of 9.8.

How Do We Determine Company Score?

The company score takes a look at factors that may influence your experience with the mattress.

Factors include length of the trial period, warranty, shipping / return costs, and country of origin.

The Sealy Cocoon Chill is available in a single firmness with a medium-firm feel, 6 out of 10 on the firmness scale.

The Sealy Cocoon has a fair level of support. During our tests, I did not feel well supported by the mattress. As discussed in the pressure relief section, the mattress creates an improper spinal alignment, which creates pressure points in my body.

During our tests, I experienced my butt and midsection sinking down more than the other portions of my body, which isn’t always uncommon or a major issue.

However, in the case of the Cocoon, it creates a significant arching of my spine between the lower and upper back due to the dramatic difference in sinkage.

While the mattress is equipped with 8.0” of support and transitional poly foam materials, neither layer appears to be particularly high quality. When you couple these foams with the thin 2.0” comfort layer you have a problem where the sleeper body abruptly comes into contact with the hard support foams.

It’s this effect that creates many of the pressure points, which in turn creates a problem for support. If sleepers cannot stay in the same spot without pressure points building you have a situation where you’re constantly tossing and turning, trying to find a comfortable position.

Overall, I am disappointed by the level of support on the Cocoon. 

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

Sleeper Weight	Stomach Sleepers	Side Sleepers	Back Sleepers
Under 150 lbs.	Maybe	Yes	Maybe
150-250 lbs.	Yes	Maybe	Yes
250-300 lbs.	No	No	No

Design

The Sealy Cocoon Chill mattress is a 10″ memory foam mattress with a medium-firm feel. It has a basic design and struggles in many performance areas.

Materials

This mattress has three foam layers and contains no coils. For a Hybrid option, check out the Sealy Cocoon Chill Hybrid.

From top to bottom, layers include:

• 2.0” memory foam
• 4.0” poly foam
• 4.0” support foam

The Cover

The cover of the Sealy Cocoon Chill mattress is pretty basic polyester cover. According to Sealy, it infused with phase change material that “absorbs and dissipates heat”. Despite Sealy’s claims, I would not describe this as a cool cover.

The Comfort Layer

The top layer of comfort foam is a 2.0″ gel memory foam. This layer has a very traditional feel, a very slow response time, and is very hard when you first lie on it.

The Transitional Layer

Below the comfort memory foam is a transitional layer of poly foam that is designed to ease pressure points and transition into the support layer below. It doesn’t look or feel very different than the support foam.

This layer is 4.0″ and is shown as the white foam directly below the blue and white swirl gel foam.

The Support Layer

The support layer is partly represented by the transitional poly foam layer, but also by the 4.0″ support foam at the base of the mattress. When combined, the two layers create an 8.0″ support layer.

Product Evolution

The Sealy Cocoon Chill mattress launched in 2016 and has had no significant design or material changes since its launch.

Other Mattresses to Consider

Not sure if the Sealy Cocoon is the right pick for you? Check out these three other top-rated memory foam mattresses for high-performing alternatives you may want to consider.

Frequently Asked Questions

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