Cocoon Chill Mattress Review


Cocoon by Sealy
Materials Foam
Firmness Medium Firm (6)
Sleep Trial 100 Nights (30-Night Requirement)
Warranty 10 Year, Limited
Price (queen) $699

Cocoon is a brand developed by Sealy, the popular American mattress company founded in 1881. The Cocoon Chill is their second offering, an all-foam mattress which features a heat-dissipating phase-change cover designed to allow for a much cooler night’s sleep than the majority of all-foam beds.

Its two firmness options — medium soft (4 out of 10) and medium firm (6 out of 10) — provide customers with a more customized bed to suit their needs. The two options differ in their comfort layers; both beds share a 2-inch layer of memory foam, but the medium-soft version also includes a 2-inch layer of medium-density polyfoam. However, both beds have a height of 10 inches, as the medium firm mattress has a high-density polyfoam support core of 8 inches, versus the softer model’s 6 inches.

Between the two firmness options, the Cocoon Chill offers comfort and support for a wide range of weights and sleep styles. To help you discover whether the Chill is the right choice for you, we’ll walk you through both the results of our in-depth testing and reviews from verified customers, as well as crucial information about Cocoon’s policies.

Cocoon Chill Mattresses At-A-Glance
Chill Nectar Mattress T&N Original Mattress
Firmness Medium Firm (6) Medium Firm (6) Medium Firm (6)
Material Type Foam Foam Foam
Height 10" 12" 10"
Price (queen) $699 $799 $695
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Cocoon Chill Mattress Review: Our Verdict

While the Cocoon Chill offers wide appeal at an attractive price-point, it isn’t right for everyone. Hot sleepers are particularly likely to be interested, for example — but while the Chill does sleep cooler than many of its all-foam competitors, those who are often very warm at night may prefer an innerspring or pocketed coil model for better airflow.

The choice between medium soft and medium firm models does allow the Chill to appeal to more customers, but the choice is not simply between firmnesses. For example, the firmer option conforms less than the softer model due to its thinner comfort system.

Finally, the Chill also shares drawbacks with many other all-foam beds, such as poor edge support and reduced ease of movement. If these qualities are important to you, you may prefer a more responsive bed with a reinforced perimeter.

Choose The Cocoon Chill if…

  • You find most all-foam mattresses to be too warm
  • You have a sleep partner with different position preferences
  • You want a choice between firmness options
  • You enjoy a balanced mattress with pressure relief

Keep Shopping if…

  • You want a firm but closely-conforming mattress
  • You prefer the airflow and support of an innerspring or coil core
  • You have mobility concerns or otherwise require good edge support and ease of movement

How Much Is the Cocoon Chill Mattress?

The Cocoon Chill has a price-point comparable to many other all-foam mattresses, though more expensive than some budget-priced options. However, it does include innovative phase-change materials in its cover in order to reduce heat retention, and is less expensive than some other choices with these materials. While not a budget or luxury option, the Chill provides luxury features at an affordable price.

The two firmness options are both priced identically, which is common but not always true of mattresses with varying firmness levels.


Sizes Dimensions Weight Price
Twin 38" x 75" 40 lbs. $469
Twin XL 38" x 80" 42 lbs. $499
Full 53" x 75" 56 lbs. $549
Queen 60" x 80" 64 lbs. $699
King 76" x 80" 83 lbs. $849
California King 72" x 84" 83 lbs. $849
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How Does the Cocoon Chill Mattress Feel?

The Chill’s phase-change cover feels somewhat cool to the touch, even once your bedding has warmed with body heat. This was true of both firmness options, although some testers reported that the medium soft bed was slightly warmer than its firmer counterpart. This is thanks to a difference in construction between the medium soft and medium firm options, as the softer bed conforms more closely to the body and therefore provides less airflow.

Due to its extra layer of medium-density polyfoam, as well as the shared 2-inch layer of memory foam, the medium soft mattress contours fairly closely to the shape of a sleeper’s body. This provides the sensation of being lightly cocooned, with testers reporting feeling as though they were sleeping ‘in’ the bed rather than on top of it.

The medium firm option still offered testers a moderate amount of pressure-relieving conforming around their bodies. However, the lack of a second comfort layer meant that this was a more balanced feel of sleeping both ‘in’ and ‘on’ the bed. Testers, particularly those over 130 pounds, also reported feeling more supported by the medium firm model.

What Is the Cocoon Chill Made Of?

The Cocoon Chill is a 10-inch tall mattress regardless of its firmness level, but its construction depends on the firmness option. The softer option includes an extra layer of polyfoam in its comfort system, while the firmer choice has only one 2-inch comfort layer but a support core that is 2 inches thicker than its counterpart.

Cover Material

All-foam beds tend to retain more heat than other mattress styles, due primarily to poor airflow through the foam layers. Cocoon has sought to remedy this in the Chill by including phase-change materials in its stretch-knit, polyester and cotton cover. Phase-change materials convert heat to energy through changing from solid to liquid (and vice-versa) depending on temperature. This process cannot be felt by the sleeper — the cover feels very much like any other mattress cover — but produces a sleep surface that feels cool to the touch.

Comfort Layers

Both the medium soft and medium firm models feature a 2-inch layer of memory foam. This conforms to the body to help prevent pressure points and next-day stiffness, but is shallow enough to prevent sleepers from feeling as though they are sinking into their bed. While this is the only comfort layer in the medium firm version of the mattress, the medium soft option has an additional 2-inch comfort layer of medium-density polyfoam. Though not as pressure-relieving as memory foam, this layer of polyfoam does mean that the medium soft model conforms more closely to the body and feels softer overall.

Support Core

The Cocoon Chill has a support core of high-density polyfoam. This is standard among all-foam mattresses and provides both stability for the bed and support for sleepers. To allow both firmness options to have the same height, the medium soft bed (which features an extra 2-inch comfort layer) has a 6-inch core, versus the medium-] firm mattress’ 8-inch core.

Does it Isolate Motion?

Rating 4/5

Both of the Chill’s firmness options have excellent motion isolation, with testers reporting only slight disturbances that would be unlikely to wake even light sleepers. This category rates how well a mattress is able to prevent other sleepers in a bed from feeling when their sleep partner rolls over, shifts, or changes positions.

All-foam mattresses like the Chill often score well here, as a foam support core absorbs motion much better than innersprings or even pocketed coils. The Chill’s memory-foam comfort layer also plays a role, as this dampens both small movements and position changes before the motion reaches the bed’s support core.

As firmer beds sometimes perform worse here than softer options, the Chill’s across-the-board success should make it an appealing choice for light sleepers who sleep with a partner and are searching for a firmer bed. (However, the Chill’s fairly weak edge support does mean sleepers may notice when their partner gets in or out of bed — see below for more details.)

Does the Cocoon Chill Sleep Cool?

Rating 3/5

While the Cocoon Chill’s phase-change cover does allow it to sleep cooler than similar all-foam mattresses, it still sleeps warmer than comparable innerspring or hybrid mattresses. Phase-change materials are cool to the touch, as they disperse heat by changing from solid to liquid depending on temperature.

However, the Chill’s lack of airflow through its foam layers still prevents heat from being fully dispersed throughout the night. Most people will find this approach adequate for their needs, but people who tend to sleep very warm may prefer a hybrid or innerspring mattress or a foam mattress with other temperature-regulating features.

Finally, the Chill’s phase-change cover can be made less effective depending on your bedding. Most fitted sheets are thin and breathable enough not to impede its effectiveness, but very thick sheets — particularly those made of less-breathable synthetic materials — may reduce the bed’s cool-to-the-touch feel. Similarly, the use of mattress toppers or pads negates the cover’s benefits.

Will It Sag Along the Edges?

Rating 2/5 (Medium soft), 3/5 (Medium firm)

The Cocoon Chill offers average or below-average edge support depending on the chosen firmness level. This is a common concern with all-foam mattresses, as even high-density polyfoam does not offer the kind of stability found in coil-based mattress cores. While the firmer option’s 8-inch support core allows for standard amounts of edge support, the softer foam layer and 6-inch support core of the softer bed leads to some noticeable sagging.

Edge support is an important consideration for couples, as poor performance here limits both sleeping and sex to closer to the center of the bed, rather than its perimeter. Getting in and out of bed may also disturb your partner, since the bed may bend when sitting on the edge. For people without sleep partners the impact of edge support may be negligible, though those with mobility concerns may want to consider a bed with a reinforced perimeter.

Is It Good for Sex?

Rating 2/5 (Medium soft), 3/5 (Medium firm)

The medium soft Cocoon Chill has below-average performance in this category, while the medium firm Chill is likely to appeal to more couples. This is unsurprising, as firmer, less-conforming beds tend to be better for sex thanks to their responsiveness and ease of motion. All-foam mattresses are particularly notorious for scoring poorly here, as they lack the responsive bounce of innerspring and hybrid models. Edge support also plays a role when judging a mattress’s suitability for sex, since good perimeter reinforcement allows couples to make use of the bed’s entire surface without worry.

What About Off-gassing?

Rating 2/5

Synthetic foams tend to have a distinct smell when new, and the Cocoon Chill is no different. The foam manufacturing process results in what are known as “volatile organic compounds”, or VOCs. While these are mostly harmless, the scent can be unpleasant. Luckily, the “volatile” in the name of VOCs is because they dissipate permanently and reasonably quickly. During testing, we found that the Cocoon Chill had a strong scent upon opening. Most testers chose to let the mattress air out for 24 hours after opening before sleeping on it, after which point the odor had decreased considerably. Within a further 48 hours, no odor remained.

What Type of Sleeper Is the Cocoon Chill Mattress Best for?

Since the Cocoon Chill has two firmness options, it is suitable for a fairly wide range of sleepers regardless of their sleep position preferences. While not offering top-tier performance for all sleepers, the Chill still provided a comfortable and supportive sleep for the majority of our sleep testers. This suitability is closely tied to the firmness option chosen, as softer or firmer mattresses are likely to be more comfortable depending on your weight and typical sleep position.

In terms of sleep position preferences, the medium firm model appeals to the widest range of sleepers, making it a good compromise choice if you and your sleep partner have differing sleep needs. However, customers under 130 pounds are generally more likely to prefer the softer model. (How much someone weighs is often the deciding factor, and is covered below.)

Many people believe they prefer a softer or firmer mattress, and personal preference does play a role in choosing the right mattress, but we encourage our readers to also take other factors into consideration. Different firmness levels (and associated differences in construction) may mean the difference between a comfortable sleep and next-day soreness.

Side Sleepers

Our side-sleeping sleep testers enjoyed the Cocoon Chill so long as they chose a firmness level appropriate for their weight. While side sleepers below 130 pounds were the only ones to rate the Chill as ‘excellent’ (when paired with the medium soft model), other testers still found the mattress relieved pressure-points while still remaining supportive.

Back Sleepers

Testers in this category preferred the Chill’s medium firm model regardless of their weight. This is to be expected, as people who sleep on their back tend to require more support — particularly around the hips, which may sink into softer mattresses and prevent proper spinal alignment. Back sleepers also require less pressure relief, as the position causes fewer pressure points than other sleep styles.

Stomach Sleepers

Once again, the Chill’s medium firm model was most suitable for stomach-sleeping testers. Stability and support is particularly important in this position so as not to cause back or hip pain, and the Chill’s 2-inch layer of memory foam helps to prevent soreness in the arms and shoulders.

Combination Sleepers

The medium firm Cocoon Chill is likely to appeal to the majority of combination sleepers, particularly those who sleep on their back and stomach. Primarily side-sleeping combination sleepers may want to choose between the two models depending on their weight, particularly since testers under 130 pounds tended to enjoy both firmness options equally aside from the softer option’s better suitability for side-sleeping.

How Does Body Weight Impact the Cocoon Chill Mattress' Performance?

As mentioned above, our sleep testers above 130 pounds tended to prefer the medium firm Cocoon Chill, while those who weighed less than 130 pounds found both models equally comfortable (except for the medium soft being more suitable for side-sleepers).

One point to remember is that mattress softness is very subjective — for example, someone who weighs under 130 pounds is likely to find the medium firm model to be very firm, while someone who weighs above 230 pounds may find it comfortably soft. Weight compresses foam to a greater or lesser degree, so choosing a mattress firmness based on your personal needs is likely to result in a bed that is also subjectively comfortable.

Finally, body weight can also impact the Chill’s edge support and temperature neutrality. People who weigh over 230 pounds may enjoy the Chill, but are more likely to find that the edge sags when they sit on their bed, or while getting in or out of bed. Similarly, the contouring produced by greater weight tends to decrease temperature neutrality, though the Chill’s phase-change cover may prevent this from becoming noticeable.

Is the Cocoon Chill Mattress Good for Couples?

Thanks to its two firmness levels and broad suitability across sleep positions, the Cocoon Chill is an attractive option for couples. While choosing the right firmness level is easier if you and your partner are in a similar weight range, side-sleepers under 130 pounds are the only true outlier when it comes to firmness compatibility.

The Cocoon Chill’s downsides for couples are its low to average performance for sex and edge support. The latter category is important as it plays a role in suitability for sex, in addition to preventing couples from sleeping further apart and closer to the perimeter. However, the Chill does have better temperature regulation than many all-foam competitors, and its above-average motion isolation is appealing for light-sleeping couples.

Please edit: Trial, Warranty, and Shipping Policies


The Cocoon Chill can be purchased through the official Cocoon by Sealy website, as well as through Amazon.


Cocoon ships its mattresses throughout the U.S., including Hawaii and Alaska, but does not provide international shipping. Standard UPS Ground shipping is free, though your order can be expedited for an additional fee.

The mattress arrives compressed and packaged in both a plastic sleeve and a protective box. Most orders arrive within five to seven days depending on your location.

Additional Services

As Cocoon uses UPS to ship all of its mattresses, no White Glove or mattress removal services are available.

Sleep Trial

Cocoon offers customers a 100-night sleep trial, which is in line with many of its competitors. Customers must commit to an initial 30-day “break-in” period, during which time the mattress cannot be returned. After 30 days, owners who choose to return their mattress can either receive another firmness option or a full refund.

Returned mattresses are picked up for disposal or donation as appropriate. Refunds are usually issued to the customer’s credit card within one to two business days.


The Cocoon Chill comes with a 10-year limited warranty. At the company’s sole discretion, they will repair or replace mattresses during this period that develop any of the covered damage. Customers are responsible for all shipping fees.

Damage covered includes visible indentations of one inch or deeper, as well as torn covers due to manufacturing defects. Ordinary wear-and-tear is not covered, and unsanitary mattresses will not be repaired or replaced.

The warranty is considered void if a mattress is resold, or if it has not been used on an appropriate foundation.

In case of a warranty claim, customers also have the option of upgrading to a different Cocoon mattress rather than have their current mattress replaced or repaired. If you choose this option, you must pay the difference in price as well as for any related pieces that are not covered under the previous warranty.