Cocoon Mattress Review

Since joining the direct to consumer game, Sealy has produced one of the best mattresses in a box. In our Cocoon mattress review, we’ll explore why this new premium foam mattress is consistently rated a hit among customers.

Made by Sealy, a giant in the mattress industry for more than 130 years, the Cocoon Chill is specifically designed for people who sleep hot and uses a proprietary material to absorb your body heat as you sleep.

Continue reading this Cocoon mattress review to learn more about the Cocoon’s product specs, pros and cons, unique features, and whether the Cocoon could be the perfect mattress to release your inner butterfly.

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Pros and Cons of the Cocoon Mattress

The Cocoon Chill is for you if: The Cocoon Chill isn't for you if:
You want great motion isolation: The Cocoon offers nearly unbeatable motion isolation. Whether your sleep partner goes to bed at a different time than you do, or you are simply easy to wake, the Cocoon will keep you as undisturbed by motion transfer as possible. You need a durable top layer: The top layer of some memory foam mattresses develop indentations more quickly than do innerspring or hybrid options. Thankfully, the 10-year limited warranty covers indents of 1” or more, so you’re covered if this does occur.
You want a generous exchange and return policy: With a 100-night trial period and hassle-free exchanges and returns, Sealy is pulling out all the stops here. And even if none of the versions of the Cocoon end up being right for you, you can feel great knowing the mattresses you tried will be donated to charity. You are a heavier sleeper: This is not unique to the Cocoon, but just something that is important to note about any all-foam mattress. For some heavier sleepers, particularly those who sleep on their stomachs, the support will not be sufficient because of the cradling qualities of memory foam. Learn more in our round-up of the best mattresses for heavy people.
You want soothing pressure relief: Common to all high-quality memory foam mattresses is great pressure relief. Side sleepers will find their hips and shoulders cradled beautifully by the medium-soft firmness level. You want white-glove service: Because it is delivered by UPS Ground shipping, there is no option for white-glove setup. The unboxing is very quick, however, and your new mattress will be easy to set up on your own.
You're looking for high scores across the board: In Mattress Advisor’s in-house testing, the Cocoon scored 9/10 in edge support, spinal alignment, and responsiveness. When it comes to the categories that matter the most for spine health and overall mattress quality, this mattress knocked it out of the park.  

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The Sealy Cocoon Mattress - An Overview

Cocoon Chill Mattress

  • Material: Memory Foam and Polyfoam
  • Firmness: Medium-soft: 6/10, Extra firm: 8/10
  • MA Score: 8.7/10
  • Customer Rating: 4.6/5
  • Trial Period: 100 days
  • Price: $$
  • Warranty: 10-year limited warranty
  • Mattress Height: 10 inches
  • Size/Dimensions:
Size Dimensions
Twin 38” x 74.5”
Twin XL 38” x 79.5”
Full 54” x 74.5”
Queen 60” x 79.5”
King 76” x 79.5”
Cal King 72” x 83.5”
Split Cal King 72” x 83.5”

MA Score: The Mattress Advisor Score is a weighted score that takes into account 14 different factors related to the mattress’ performance, function, convenience and the brand’s social responsibility.

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Cocoon Mattress Materials

Inside layers of the Cocoon mattress

What’s Inside the Cocoon Mattress?

The Cocoon by Sealy is an all-foam mattress, consisting of a Chill cover, a layer of high-quality, higher density memory foam, and a Base Support System. Both parts are composed of memory foam. The difference between the Extra-Firm Cocoon and the Medium-Soft Cocoon lies in the proportion of the layers and the density and consistency of the base layer.


The Cocoon by Sealy has a cover specifically designed to allow you to get the maximum benefit out of your memory foam. After all, what good is memory foam that contours to reduce pressure point pain if your cover is so taut that it defeats that purpose? Cocoon uses a premium stretch-knit cover to allow for the perfect amount of give.

Thanks to the Chill mattress cover, you get the best of both worlds, as that same flexible cover is infused with their propriety “Phase Change Material” that absorbs your body heat, leaving you nice and cool. Because of this, the Cocoon is one of the best cooling mattresses.

Perfect Fit Memory Foam

The first layer of both the soft and firm options is the Comfort Layer. A thin layer of Perfect Fit Memory Foam, which is a high-density foam, cradles you while you sleep. How far you sink into the hug of this foam depends on the following layer.

Personalized Comfort Layer

After the Perfect Fit Memory Foam ends, the polyfoam begins! This is where the primary difference between the medium-soft and extra-firm versions lies. The softer version includes 2” of a comfort polyfoam to provide a softer transition between the top memory foam layer and the firm and durable support layer. The firm option transitions directly from memory foam to the Base Support System, providing firm support closer to the surface of the mattress.

Essential Support Base Layer

Both firmness options contain a Base Support System, consisting of Essential Support Foam, designed to be robust and durable. Sealy puts this foam through rigorous testing so that your memory foam bed will last for a very long time.

In this layer, the Extra-Firm Cocoon uses Reinforced Essential Support Foam. The Medium-Soft Cocoon is built with Flexible Essential Support Foam, which is the other key difference between these firmness options.

Cocoon Mattress Features

Motion Isolation

Motion isolation refers to the control of motion transfer across the mattress. If you sleep with a partner, this is especially important. Also important for co-sleepers and those with pets that bounce in and out of bed all night long, motion isolation is key to getting a good night’s sleep when you don’t sleep alone.

Of all of its fantastic features, the Cocoon’s motion isolation is possibly the best. Its layers of dense foam will absorb the movements of your tossing and turning partner, allowing you to sleep soundly and undisturbed.

Pressure Relief

If you’ve ever slept on a rock-hard mattress or done a lot of camping on the hard ground, you understand how important pressure relief is in a sleeping surface. When you lay down, certain parts of your body (such as the shoulders and hips for side sleepers) come into contact with your mattress before others, and a mattress that doesn’t conform to your body can lead to those pressure points receiving extra pressure. The ideal mattress both supports your body and conforms to its points and curves.

The Cocoon Chill mattress has outstanding pressure relief. Because of its soft top layer, it allows your body to remain in nearly perfect alignment when you lay down, which is especially important for side sleepers. The medium-soft mattress has more give than the extra-firm mattress, though both ranked high on our pressure relief test.

Read more about the best mattress for side sleepers.

Customizable Firmness Options

The Cocoon by Sealy comes in two firmness levels: medium-soft and extra-firm. Mattress Advisor tested both mattresses and ranked the medium-soft a 6/10 for firmness and the extra-firm an 8/10, which is part of the reason why the Cocoon is considered one of the best mattresses for back pain.


This is the ideal firmness level if you prefer to feel like you’re sleeping “in your bed,” as opposed to “on your bed.” The medium-soft Cocoon’s central firm layer is what differentiates it from the extra-firm. Both mattresses have the top layer of Perfect Fit Memory Foam, but the medium-soft also has a 2” transitional layer, which allows your body to settle a bit deeper into the mattress.


It’s important to note that “extra firm” is extra firm for a memory foam mattress, but still has some ability to contour to your body and relieve pressure. This is different from some extra firm innerspring mattresses. This option is great for those who need the pressure relief of foam, but still require strong support.

Read more about the best memory foam mattresses.

Certi-PUR Certified

When you first open your Cocoon, you may notice a slight odor from what is known as off-gassing. Off-gassing happens when unwrapping any new foam mattress or mattress with foam layers. Strong chemical odors associated with some off-gassing are a result of volatile organic compounds (VOCs) being released into the air. Certain VOCs can be dangerous, and cause symptoms such as headaches and dizziness.

You can rest easy knowing that Cocoon is certified by Certi-PUR, a not-for-profit organization that tests mattress materials for VOCs, heavy metals, formaldehyde, and dangerous flame retardants. This certification is rigorous and a point of pride for any mattress manufacturer. So, any mild odor that you notice is not a cause for concern and will dissipate after a couple of days.

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Compatible Foundations

Like any all-foam mattress, the Cocoon needs a little bit of support to do its best work and to retain its shape. Sealy sells custom-designed Cocoon foundations, which are a great option. You can also opt for a box spring, adjustable base, platform bed frame, or slatted bed frame. If you use slats, make sure they are a minimum of 2 inches wide and a maximum of 5 inches apart.

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Sleeping Positions Best for Cocoon

Side Sleepers

Side sleepers need a bed that conforms to their body while still providing support. When you sleep on your side, it’s easy for your spine and neck to end up curved instead of in a straight line. You need a mattress that will conform to your unique body shape while providing cushioning to the spots that need it most.

The Cocoon is one of the best mattresses for side sleepers. Its superior pressure relief properties allow for a straight, healthy spinal alignment throughout the night. It is also great for those who toss and turn between their side and back throughout the night, as it received a strong responsiveness score. This means that when you switch from side-to-side or side-to-back, your Cocoon will quickly adjust to support you in the new position.

Back Sleepers

Back sleepers have a bit more freedom when it comes to the best type of mattress for their needs. While you need a little bit of give for the gluteal area and your heels, there just aren’t as many pressure points to worry about. Because of this, support often ranks pretty high on the back sleeper’s mattress checklist.

For this reason, the extra-firm Cocoon is one of the best mattresses for back pain. It still has a layer of contouring foam on top, which will give way for some curves, but there is more support in the middle foam layer. However, if you are a back sleeper who tends to like softer mattresses, the medium-soft is also a solid choice for back sleepers.

Stomach Sleepers

People who sleep on their stomachs need more support. This sleeping position is arguably the worst position for spine alignment. It is easy to sink too much into an extra soft mattress and end up with an arched back and an out-of-whack neck.

Memory foam mattresses can still work for stomach sleepers, however, as long as they’re on the firmer side. The extra-firm Cocoon will likely be the better choice of the two for you if you sleep on your stomach. The extra-firm is also the better option if you’re looking for the best mattress for heavy people.

More About the Sealy Cocoon

Sealy hasn’t just halfheartedly joined the bed-in-a-box mattress business by offering to ship to your door. They have taken heart of all of the great benefits offered by many similar companies that customers love. Read on for some highlights of what they offer their online customers.

100-Night Trial Period

Sealy understands that every sleeper has different needs, so they offer a generous trial period. You can try out your Cocoon mattress for up to 100 nights and return it for any reason. If you are unsatisfied with the mattress, Sealy will arrange to have it picked up and donated at no cost to you and issue a full refund.

We recommend that you give it at least 30 days to adjust and make up your mind, especially if you were sleeping on a hybrid or innerspring mattress before. There is no required minimum, though, so if you know from Day 1 that you need something different, that’s perfectly fine!

Free Exchanges and Returns

On top of their generous 100-night trial period, Sealy is committed to making sure you are happy with your mattress. If you find you aren’t loving your choice, they will let you try out the other firmness level to see whether that’s a better fit. If that doesn’t work, then they will move forward with processing your full refund and donating your mattress, all at no extra cost to you.

Responsive Customer Service

If you have any questions at all, the customer service team is incredibly knowledgeable and quick to respond. One benefit of buying from a major player in the mattress industry is that you as a customer won’t run into long wait times to hear back from an overstretched startup team. You can reach their representatives by chat, email, or phone Mon - Fri 9AM - 9PM EST and weekends from 9AM - 6PM EST.

Made in the USA

All Cocoon by Sealy mattresses are designed and assembled in the USA. Your new mattress will ship directly from their facility in Belmont, Mississippi.

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Cocoon Mattress FAQ

  1. Can I finance my Cocoon mattress?

    If you want to finance your Cocoon mattress, it is possible but does require purchasing using a Cocoon by Sealy credit card. By signing up for the credit card, you are eligible for 0% APR for 12 months with equal payments on a minimum purchase of $500.

  2. How long will it take for my Cocoon mattress to be delivered?

    Even before you place your order on, the website will let you know a delivery estimate for your location. Delivery takes an average of 5 to 7 days. If you need faster delivery, just reach out to their customer service team to discuss UPS Next Day, UPS Second Day, and UPS Saturday Delivery options.

  3. How does the 10-year warranty work?

    The Cocoon offers a pretty standard 10-year full-replacement limited warranty. This covers defective mattresses (including tears in the cover), as well as any indentations of 1” or more. Like with any warranty, if it appears that the mattress has been harmed by misuse rather than regular wear and tear, you may run into issues.


If you are looking for the best memory foam mattress, the Cocoon by Sealy is worth considering. With customizations in firmness, memory foam mattress lovers are likely to find a great mattress to fit their needs.

The Cocoon boasts incredible motion isolation, pressure relief, spinal alignment, and responsiveness, making it a great choice for a number of sleepers:

  • Couples and those sharing their mattress with a child or pet will love the lack of movement transfer across the bed.

  • Side sleepers will find the perfect balance of sinkage in the right spots and support in the base polyfoam layer.

  • Combination sleepers will appreciate the quick responsiveness, as well as the combination of give for side sleeping and support for back sleeping.

Because of Sealy’s generous 100-night sleep trial and commitment to easy exchanges and refunds, you will either end up with the perfect Cocoon for you or get your money back, hassle-free. There is really nothing to lose! Are you ready to see if the Cocoon is right for you?

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About the Author Natasha Gleichmann, M.B.A.

Natasha works full time as a Communications Manager, goes to school full time preparing for medical school, and maintains a healthy freelance writing career. All of these full time lives make her quality of sleep especially important.