Cocoon Chill by Sealy Review

Updated May 8, 2020

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If you’re like many, you’ve been interested in memory foam but just aren’t sure you’re willing to give up a cool night’s rest. It’s true that traditional memory foam did tend to sleep hot, but many new innovations have been introduced into the industry. The Sleep Judge recently got the opportunity to see just how well the Cocoon Chill by Sealy was able to overcome some of the common memory foam complaints and put out a product that can offer the contour of memory foam while helping you sleep cool and facilitating ease in movement.

Cocoon Chill incorporates the use of innovative phase change material that absorbs and dissipates heat for a refreshing, cool-to-the touch surface. With two firmness options to choose from, you can enjoy a degree of customization that can really make a difference, so let’s jump in and learn more.

Video Review

Don’t want to read the full review? Watch our video review instead.

Cocoon Mattress Video Review

A Long History and Positive Reputation

Companies make it in business when they’re able to offer customers a quality product and premium customer service. Sealy has been in business for more than a century. This in itself says a lot about their business model and ability to adapt to change over time. It all started in Sealy, Texas in 1881. Daniel Haynes, a cotton gin builder, began constructing cotton-filled mattresses to friends and family. His products grew in popularity, and the phrase “mattresses from Sealy” was coined to identify these premium sleep products of long ago.

Sealy has had over 13 decades of trial and error to better understand what consumers want, and the fact that they’re still in business tells us they listen to feedback and are able to offer what people are looking for in a new mattress. So, let’s take a look at what they came up with when it comes to the construction of this product.

A Look Inside the Cocoon Chill by Sealy

It’s what the inside that counts, and this couldn’t be more true when it comes to mattresses. The premium, stretch-knit cover is designed to help you sleep cool and infused with a proprietary “Phase Change Material.” This is your first line of defense in cool sleeping, and we’ll explain it in further detail in a moment when we discuss breathability.

The first layer beneath the cover is composed of two inches of Perfect Fit memory foam that adapts to your body size, shape and sleep position. Memory foam of the past had a tendency to envelop sleepers and make it hard to move around. However, the very first memory foam layer makes getting in and out of bed and adjusting yourself simple. Easy movement is further facilitated by the layers beneath the memory foam.

Right above the bottom support layer is the 2 inch personalized comfort layer. You get to choose between Cocoon’s soft layer for a cozier “in-the-bed” feel and their firmer “on-the-bed” feel. Plusher products are better for those who don’t carry much weight while I’d recommend the firmer version if you do weigh more or sleep on your stomach a lot. I have the plusher personalized comfort layer, so that’s what we’ll be analyzing as we dig further into this product.

The layers are supported by final 6 inch layer of essential support foam. It’s engineered to be highly durable and resilient. If you do decide to go with the firm option, it’s comprised of 2 inches of Perfect Fit Memory Foam and 8 inches of Essential Support Foam. Either way, you can rest assured in knowing the materials are CertiPUR-US certified.

Firmness and Sinkage Expectations

For the plusher product, let’s take a look at what you can expect when it comes to sinkage. I stood in the middle of the mattress to see how much my 130 pounds, when applied to a 9 by 13 inch area, caused me to sink into the mattress. The average is around 6 ¾ inch for a medium product. Here, you can see I sunk in about seven inches.

Considering Cocoon’s firmness scale you’ll find on their website, it can be a little difficult to judge just how firm the two options are as they both kind of meet up in the middle of the entire spectrum. Based on this test, it would appear that the Cocoon soft mattress is slightly plusher than an average medium sleep product. This could be a great fit for light weight people who often feel they don’t get to enjoy the feel of the deeper layers of their mattress.

Product Feel and Comfort

When I laid on my Cocoon Chill, I could definitely feel the memory foam at work as I felt myself sink in a little bit. I could also noticeably feel how the material conformed primarily in my hip and shoulder areas. However, there is a definite point where the memory foam stops and the lower-level foams kick in to act in providing uplifting support.

You can see what I’m talking about when you take a look at our video. You can see how quickly the mattress responds when I apply pressure and release it quickly. It wouldn’t even appear that it contained memory foam at all. As a memory foam veteran since its introduction into the industry, I’m impressed. There’s usually a little bit of lag time in memory foam, but the Cocoon resumes its shape almost immediately. If you’ve always liked the idea of memory foam but didn’t want to feel like you were sinking into your sleep product, this could be a great option to consider. Both the Chill and Classic versions are capable of holding up to 500 pounds.

Cocoon Motion Transfer Reduction

If you’ll be using your Cocoon Chill with a sleep partner, you want to ensure you know what to expect when it comes to motion transfer reduction. Motion transfer is when you’re able to feel your partner’s movements through the mattress materials when they move or get in and out of bed, and it can be highly disruptive. Ideally, you want to sleep straight through the night without being disturbed, and memory foam is typically able to keep motion transfer low. We checked to see what you can expect using two 20 pound medicine balls.

First, we took a look at the bounce of this product. I expected it to be low considering the presence of the memory foam. The ball bounced 1 ½ times before coming to a rest. I scooted it over to the side and dropped another 20 pound ball in different areas next to the resting ball. The memory foam doesn’t disappoint in keeping motion transfer low, and I think this product is accommodating for sleep partners in this aspect.

Breathability and Temperature Regulation

Since you’re looking into the Cocoon Chill mattress by Sealy, there’s a good chance you’re looking for something to help you sleep cool. If that’s the case, I think you’ve definitely come across a product that could offer just what you’re looking for. Cocoon mentions on their website that this product is cool to the touch, and I can attest that this is true. When I touch the cover, it does feel very cool.

I personally suffer with hot feet when I sleep. I noticed sleeping on Cocoon Chill that I could cool them off by moving them onto different exposed areas of the mattress. I’d encourage you to use a sheet and, better yet, a mattress protector, so you won’t actually feel this “cool to the touch” sensation under these conditions. However, I think this goes to show that the use of the Phase Change Material does seem to make a difference in absorbing and dissipating heat.

Let’s take a moment to get a better understanding of what phase change material is. This material works to maintain a regulated temperature by absorbing heat as the external temperature rises. It’s capable of storing and releasing large amounts of energy to the point of melting or solidification. Basically, phase change material gradually adjusts to an equilibrium with the sleeper. It’s being used in a growing number of ways including:

  • solar cooking
  • thermal protection of food
  • textiles designed to keep you cool

Heat Transfer Test

We took a look at how well the Cocoon mattress would perform after laying on it for 30 minutes in a room temperature of 64 degrees Fahrenheit. Average cooldown time for the products I’ve tested is around ten minutes. Cocoon was able to achieve room temperature in just 8 minutes. Considering memory foam is in use, I think this was an exceptional time. I felt notably cool sleeping on the Cocoon Chill as the name implies I would, and I think this is an excellent sleep solution if hot sleeping is a primary concern.

CertiPUR-US Certified

The Cocoon Chill by Sealy uses materials that are CertiPUR-US® certified, and this tells you quite a bit about the quality you can expect. This certification indicates that the materials used are:

  • Made without ozone depleters
  • Made without mercury, lead, and other heavy metals
  • Made without phthalates regulated by the Consumer Product Safety Commission

Durability Expectation

Let’s get an idea of the durability expectations by taking a look at the density of each layer. For memory foam, you want a density of 4-5 pounds. In the Cocoon mattress by Sealy, we find a density of 3 pounds in the Perfect Fit memory foam layer and 1.8 pounds in the Comfort Layer memory foam.

The density you want to look for in the support foam is at least 1.5 pounds. The Cocoon is 1.8 pounds in the transition and base layers which helps to make up for the 3 lbs in the comfort layer. Since the more weight you carry will cause more wear and tear, I’d recommend those who are heavier to strongly consider the firm option. It features three pound memory foam in the comfort layer with a larger eight-inch chunk of the high-dense support base.

Maintenance, Protection, Care, and Warranty

After spending about 1 ½ weeks taking a look at the Cocoon Chill, I felt that it really lives up to its name in breathability claims. There is nearly zero motion transfer, and I know I found peace-of-mind in knowing that Sealy is a reputable company that has been in business for more than 100 years. If you suffer with painful pressure points but have shunned memory foam in the past due to hot sleeping and sinking in, I think this could be the breath of fresh air you’ve been looking for.

If you think Cocoon Chill by Sealy could be the one, let’s take a look at a few more important aspects that’ll be good to know once you become a customer.

100 Night Sleep Trial and Financing Options

You’ll get the opportunity to use your Cocoon Chill mattress for a full 100 nights before your purchasing decision becomes final. This gives you more than enough time to thoroughly break the product in and understand how the combination of materials will work for your needs. If you aren’t happy with what you get, they do offer the opportunity to try out the other firmness option before you either donate it to a charity or allow Sealy to have someone pick it up. Either way, you’ll receive a full refund.

Sealy understands that budgets can be tight. That’s why they offer convenient financing options. You shouldn’t have to compromise on quality sleep just because you don’t have the full amount available all at once, and this can be a great way to get the rest you need now.

Cocoon Chill by Sealy Cost

Cocoon Chill by Sealy goes to show how well the mattress industry has done in incorporating consumer feedback into offering more efficient products. I found this mattress to defy the common stigma of memory foam when it comes to sleeping hot and causing sleepers to feel stuck. With financing options available, you could be closer than you think to a comfortable night’s rest, so let’s go ahead take a look at the cost:

  • Twin- $549
  • Twin XL- $599
  • Full- $799
  • Queen- $949
  • King- $1,149
  • California King- $1,149

Cocoon Reviews and Feedback

While I do think the densities of the plusher version of this product may not be suitable for those who carry a lot of weight, the firm option features the higher densities that can help you make the most of your purchase. I also think Cocoon Chill could be a good fit for those who:

  • Sleep hot
  • Have a sleep partner
  • Suffer with aches and pains that could be accommodated by memory foam’s contouring support

I was most impressed with how quickly the mattress cooled down in our thermal test, and I was also surprised with the degree of response you’ll experience in the top memory foam layer. However, everyone has their own opinions, so I took a moment to see what other customers have had to say about the Cocoon Chill by Sealy:

The Good

  • Mattress sleeps cool
  • Firmness and financing options convenient
  • Great motion isolation
  • Excellent company reputation

The Bad

  • Some complaints of offgassing

Who We Recommend the Cocoon Mattress For

With so many products on the market, it can be difficult to make your final mattress purchasing decision. While you’re excited to enjoy a new sleep surface, it’s important that you do adequate research to help you find the perfect product for your unique sleeping needs.

If hot sleeping has been an issue you’ve suffered with, I think Cocoon Chill is definitely worth taking into consideration. You won’t have to spend a fortune, and you receive a product that successfully overcomes the common complaints in memory foam. If this sounds like a sleep product that could be the right solution for you, let’s recap some of the highlights. Cocoon Chill could be a great investment if:

  • You have a sleep partner.
  • You want the peace-of-mind in knowing you’re working with a well-established company.
  • You want to sleep comfortably but don’t have thousands of dollars in your budget.
  • You don’t want springy bounce

You may want to read: Sealy Posturepedic Response Performance Santa Paula IV Cushion

Our Final Verdict

You get what you pay for. This adage is true in most areas of life. However, when you rely on the traditional mattress business model, a lot of what you’re investing in includes middleman markups and costly commissions paid to pushy salesmen who don’t necessarily have your best interests in mind. When you purchase Cocoon Chill, you are able to cut down on many of these unnecessary costs and receive your mattress direct from Sealy.

Since Cocoon Chill offers two firmness settings, I think this helps add diversity that allows them to cater to a larger market. I do have a few concerns about the density found in the memory foam of this product. However, considering the price, you’re still getting a pretty good deal. Higher densities do come at a higher price. I think you’ll be impressed at this product’s ability to breathe, and the memory foam helps to isolate motion and add that contour you need to reduce or eliminate aches and pains.

Cocoon Mattress Specs Sheet

Material Thickness ILD Density
Stretch knit cover n/a n/a n/a
Perfect Fit memory foam 2 inches n/a 3 lbs.
Personalized comfort layer 2 inches n/a 1.8 lbs.
Essential support foam 6 inches n/a 1.8 lbs.


Offgassing Firmness Level (Scale of 1-10) Trial Period Warranty
I experienced minimal offgassing 5 100 nights 10 years

Frequently Asked Questions

Is a Foundation Needed?

It’s not required that you use a foundation with your Cocoon Chill mattress. However, it’s important to understand the increase in the chance of developing mildew if you choose to go without. Direct contact with organic surfaces on the floor can damage your sleep product, so I’d definitely suggest the supplemental purchase of a foundation if you don’t have one.

Is a Mattress Pad or Protector Needed?

The choice of using a mattress pad or protector is up to you. However, you never know when you might spill something, and buildup of dead skin cells and sweat can do a number to your mattress over time. It’s never a bad idea to consider a quality mattress protector to increase the durability of your mattress.

Does it Work on Adjustable Beds?


Are Returns Hassle-Free?

100% full refund during 100 night sleep trial.

What’s the Warranty?

10 years.

Is There A Trial Available?

Yes, 100 nights.

Does It Need To Be Rotated?


What's the firmness?

There are two firmness options: Cocoon Soft and Cocoon Firm.