Medium-firmness will have broad appeal
Good for back sleepers
May not be suitable for side sleepers
Sleeps slightly warm
What is the Cocoon by Sealy Chill mattress?
Sealy is one of the older mattress brands in the U.S., with roots that go back well over 100 years. It launched Cocoon by Sealy in 2016, testing more than 100 prototypes to find the best options for “shippable” mattresses.
Its most popular mattress, the Chill is designed to provide cooling. But after reviewing the specifications, it seems as though the company relies on a cooling cover that's made with a "proprietary phase change material" to bring that chilly sensation, as opposed to integrating cooling technology and materials throughout the entirety of the mattress. The cover purportedly absorbs and dissipates heat. Beneath the cooling cover, two layers of foam rest atop a base support layer (that’s also made of foam).
How did we test the Cocoon by Sealy Chill mattress?
We run lab and home-based tests on every mattress that makes an appearance at Reviewed. Former editor Sara Hendricks slept on the Cocoon Chill for a full month. She considered everything from what it was like to unbox the mattress to how it actually felt to sleep on it.
While the home test is pretty self explanatory—our lab tests are more complex. They include using a Newton’s Cradle (that iconic desk toy with suspended metal balls) to check for motion isolation. We also heat mattresses with an electric blanket to measure the temperature over the course of hours to see if beds trap and retain warmth.
What's it like to unbox the Cocoon by Sealy Chill mattress?
When the Cocoon Chill arrived at our tester’s apartment, she was surprised by just how light and relatively easy it was to get up the stairs. (Note that “light” is relative when it comes to mattresses in a box—most weigh around 100 pounds.) Sure enough, it comes in at 82.5 pounds—and that’s including the box. For comparison, a queen-size Awara mattress, a hybrid mattress, weighs 129 pounds, and the all-foam Purple mattress weighs 100 pounds.
The mattress also came with very clear directions on how to unbox the bed, which made the process fairly easy.
What we like about the Cocoon by Sealy Chill mattress
It’s truly a medium-firm mattress
Not everyone is looking for a medium-firm mattress. But if you are, our tester swears the Chill really hits that middle line. It may be a dream option for those who want just enough cushion without sinking in all the way. In particular, it seems it would be well-suited to back sleepers who prefer an overall softer sensation.
This balance is likely thanks to the comforting combination of a soft top layer and a firm core. It molds to the body and creates some heat, but the cooling layer seemed to offset anything that might cause intense night sweats—our tester sleeps hot and thought this made it feel cozy, not cloying.
The price is reasonable
Mattresses are not cheap. Some baseline models, like the basic Tempur-Pedic Tempur-Cloud, cost more than $1,000—and that goes for the Cocoon Chill, too. But with the company’s evergreen discounts, it usually falls to about $800 for a queen, and that includes freebies like pillows.
This makes it a great price for folks who don’t want to spend a fortune on their mattress. It may also fill the bill for those who are looking for something cheaper, but still high-quality, to serve as, say, a guest bed.
What we don’t like about the Cocoon by Sealy Chill mattress
It runs a bit hot
This isn’t the coolest bed we’ve tested—and its slightly enveloping surface didn’t help in that regard. Our tester attributed the warmth partially to the mattress’s soft upper layer. In lab testing, we found that it wasn’t the best at diffusing heat—even without the pressure or weight of a human form.
When we tested the Cocoon Chill by Sealy, we placed an electric blanket atop the mattress for hours to observe whether the bed readily diffused heat. Though it wasn’t the warmest mattress we’ve tested, it still heated up incrementally in this setting, too. It may not be the best for hot sleepers and certainly doesn’t totally live up to the “Chill” name. That said, our tester never had a complaint about it running hot. In fact, many reviewers say it feels cool, so it’s likely a matter of personal preference that can only be settled by actually sleeping on the bed.
It may not be supportive enough for all sleep positions
Our tester prefers to sleep on her back and side, and this mattress was a bit softer than what she usually prefers (generally something on the firm end of the spectrum, like the Awara).
She had discomfort in her lower back following several of the nights she slept with the mattress, but notably only when she slept on her side. She wasn’t able to discern whether it was more attributable to the mattress itself, or if it was just that signature “I’m no longer as spry as I once was.” As it only happened when she slept on her side, she felt as though it was more to do with the mattress not providing enough support, which raised questions about whether it veered towards too soft, in her mind.
It doesn’t have great edge support
The Cocoon Chill was barely supportive under our tester’s weight. Instead of providing a rigid corner for her to perch on, it sank under her body weight. Though this may not be a big deal for some consumers, it’s not great if you like to sleep near the edge of the bed.
What are Cocoon by Sealy’s trial, warranty, and return policies?
Cocoon by Sealy offers a reasonable trial policy—you have up to 100 days after your purchase to initiate a return.
The company doesn’t require a minimum trial to allow your body to adjust to the mattress—others such as Casper specify that you must give its products a go for a set number of days. Instead, it sounds as though you can immediately return a Cocoon by Sealy product if you find you’re unsatisfied with the purchase.
Cocoon by Sealy will pick up the mattress, though a customer service rep said you could also “donate it to a qualifying organization and get a receipt, for which you will be refunded.” The hassle-free option of having the company pick up the mattress is likely better for anyone who is dissatisfied, as it means you won’t have to deal with trying to move the product or strap it to the top of your car.
The company offers the same 10-year warranty that’s typical for most bed-in-a-box companies. Though the Cocoon website doesn’t advertise setup requirements for the bed, chatting with customer service told a different story.
Using the mattress with a box spring doesn’t void your warranty, according to a customer service rep. However, using bases that don’t provide adequate support will negate your warranty. The website’s warranty description didn’t provide sufficient details on things like slatted bases, which come in a variety of widths, to determine what exactly constitutes “insufficient support.” If you’re concerned that your setup may void the warranty, try chatting with customer service to confirm or relieve your suspicions—and save the transcript.
What current Cocoon by Sealy owners are saying
The Cocoon by Sealy Chill has more than 6,100 reviews and a 4.6 star average. The vast majority gave it high marks—more than 5,700 reviewers awarded it four or five stars in total.
Many praise the experience of sleeping on the mattress. One buyer was particularly skeptical at the prospect of buying a mattress without touching it, but surprised by the outcome: “From my first night's sleep, it has been phenomenal,” they wrote. “Night after night, I was awaiting for something to go wrong—perhaps the comfort or form would wear out. Now after having the Cocoon for about four months, I really don't know how I've existed all these years without this mattress.” The reviewer swears by how the mattress cradles and conforms to their body perfectly.
It was difficult to find Cocoon by Sealy’s ratings on the Better Business Bureau (BBB). Instead of a clear page for the company, there were numerous entries that alluded to its performance. We excluded that information from the review given we couldn't discern which page belonged to the company—or if it had one to begin with.
Is the Cocoon by Sealy Chill mattress worth it?
The Cocoon Chill mattress comes through on its promise: It stays relatively cool and provides cozy support at a reasonable price.
The memory foam mattress won’t be for everyone. It’s the true definition of a medium-firm mattress. As such, someone who wants a very soft or very firm mattress may be disappointed. Our tester also felt that those who prefer back sleeping may find better options out there. Finally, it may not provide the pressure relief some side sleepers may want.
What other mattresses in a box do we recommend?
If you want a truly soft mattress, the Nectar mattress offers a sublime sleep surface that’s supple and great for side sleeping. While it’s not our top pick, we think it’s great for certain sleep positions. Plus, it sleeps far cooler than most all-foam options we’ve tried. Read our full review.
The Tuft & Needle Original swings to the other end of the spectrum as a firm mattress. You feel almost as though you’re floating above its surface, as opposed to being enveloped in it. It’s a great option for stomach sleepers, as well as back sleepers who prefer a more supportive sleep surface. Read our full review.
The Brooklyn Bedding Signature Hybrid is another middle-ground mattress that’s a hybrid (meaning it has innerspring coils). Our tester tried the medium-firm version and found it skewed toward the soft side. But the firm version may provide the perfect medium support—and hybrid design—if that’s what you’re looking for. Read our full review.
Prices were accurate at the time this article was published but may change over time.
Meet the testers
Sara Hendricks is an editor with Reviewed covering health and fitness.
Senior Staff Writer, Sleep@lindseyvix
Lindsey writes about sleep, lifestyle, and more for Reviewed. In her waking hours, she likes to spend time outside, read, cook, and bake. She holds a master’s in journalism from Boston University and bachelors' degrees in English Literature and Anthropology from the University of Utah.
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