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Cocoon by Sealy Chill Mattress Mattress Review

Sealy branched out in 2016 to offer its version of the growing ever so popular, bed-in-a-box with the Cocoon by Sealy. The newer Chill version of the Cocoon by Sealy simply raises the stakes by adding material that regulates your temperature while you sleep.

Nerd Score: 4.8/5

Our Verdict: If you are looking for an affordable, cooling mattress with multiple firmness options, look no further than the Cocoon by Sealy. Created by the mattress giant, Sealy, the Cocoon brings Sealy into the bed-in-a-box space to give consumers an all-foam option delivered right to their door.


Best For…

May Not be Best For…

Anyone who sleeps like a raging furnace and needs help staying cool

✅Anyone on a limited budget who wants a memory foam mattress 

✅Anyone who loves the feel of memory foam

✅Any couples who value motion isolation

✅Anyone searching for perfect “medium-firm” feel 

Couples who use the entire bed surface due to weaker edge support

❌Anyone counting on a brick-and-mortar presence of a huge mattress company

❌Cocoon by Sealy mattresses are only sold (and dealt) with online


If we link the word “cocoon” with “sleep,” I think most of us would agree that we’re painting the ideal picture when it comes to getting a good night’s rest. We want to feel secure when we sleep. The name itself set the scene for consumers when industry leader Sealy rolled out the Cocoon by Sealy Mattress in 2016. Now add the word “chill.” The newest memory foam iteration of the Cocoon by Sealy line still has that comforting feeling, but now it also keeps your body at the right temperature.

The 10-inch thick, full memory foam Chill model has phase change material within the cover itself. “Phase change” materials regulate body temperature in this mattress. The material absorbs heat when you’re too warm and releases it when you’re too cold. The material does that by changing phases, becoming solid in a cooler state and melting/liquefying in a warmer state.  


Mattress companies are always on the lookout for ways to keep a sleeper cool at night. Scientific research suggests that the optimal room temperature for falling asleep is 68 degrees. Our bodies operate at 98.6 degrees. If you sleep on a mattress that retains heat, you won’t be able to stay in that cool zone. 

For this version, Cocoon by Sealy addressed it directly by adding  “phase-change” material to the cover of the Chill mattress. Phase-change material absorbs heat when you’re too hot to cool you, and releases it when you’re too cold to warm you, to regulate your body temperature against extreme highs or lows.

Sealy promises that their “perfect fit” memory foam will work for your “body size, shape and sleep position.” That’s a large promise. Memory foam always does well adapting to curves and cradling sleepers. The Chill mattresses have two types, the comfort layer and a durable, high-density type for the support layer. Cocoon by Sealy varies the second layer to offer you a medium-soft and an extra-firm option.

Customers approve of how easy it is to move and how quickly it inflated into its full shape out of the box. Those are key things to look at if you need that bed quickly and you’re shopping online for these types of mattresses.



  • Twin 38” x 74.5″ x 10″
  • Twin XL 38” x 79.5″ x 10″
  • Full 53” x 74.5″ x 10″
  • Queen 60” x 79.5″ x 10″
  • King 76” x 79.5″ x 10″
  • Cal King 72” x 83.5” x 10″

Prices (same price per size for Med Soft or Extra Firm)

  • Twin $600
  • Twin XL $650
  • Full $760
  • Queen $930
  • King $1,150
  • Cal King $1,150


  • Twin 39.5 lbs
  • Twin XL 42.1 lbs
  • Full 55.7 lbs
  • Queen 64.4 lbs
  • King 82.6 lbs
  • Cal King 82.5 lbs


  • Medium Soft is more like a 4/10 on the firmness scales
  • Extra Firm is not quite “extra” and feels more like a medium-firm or the coveted 6/10 on the scale.


The Chill mattress has two layers of foam, and the base layer will vary in density depending on which firmness level you choose. The top comfort layer is made of the Perfect Fit memory foam from Sealy. It will cradle your curves and that’s what you want at the top to keep your spine in a neutral, straight position as your sleep.

The support layer is made of “Essential Support Foam.” It’s heavier and denser. Be advised here: Because the Chill mattress comes in both Medium Soft and Extra Firm, this bottom layer will vary in density depending on which you choose. The medium-soft version has a Flexible Essential Support Foam and the extra-firm model comes with a Reinforced Essential Support Foam.

The fabric cover was made with a phase-change material that will keep you cool as you sleep. Phase-change materials regulate temperature by release heat if you’re too cool or drawing it away if you’re too warm. It is breathable and durable. It’s also made of a stretchy material that won’t constrict your movements on top of the comfort layer.

Cocoon by Sealy Chill Mattress by Sleeping Position

  • Side sleepers — Cocoon by Sealy Chill in Medium Soft
  • Back sleepers — Cocoon by Sealy Chill in Extra Firm
  • Stomach sleepers — Cocoon by Sealy Chill in Extra Firm


Shipping, Delivery, and Returns

Mattresses are shipped compressed inside a box for free via UPS Ground from the company’s plant in Mississippi. Cocoon by Sealy won’t ship outside of the United States. You can call the company if you’d like to talk about Saturday or expedited delivery. In general, the mattress will arrive between 5-7 days.

Cocoon by Sealy Chill Mattress Trial-Period

You have 100 days to figure out if the mattress works for you. And you’re allowed to send it back once during that time frame if you want to swap the Medium Soft for the Extra Firm version or vice versa with no fees. After that, if you still want to send it back, you’ll receive a full refund of the purchase price within 1-2 days after you make arrangements. Sealy will work to find a place to donate or recycle the mattress. 

I would tell anyone to test drive a new mattress for at least 30 days of whatever trial period you have for your mattress.  It’s just a smart way to approach a new mattress. It takes at least 30 days for you to adapt to the feel of the mattress and to break it in. If you end up not liking it, the company will refund you 100% of the purchase price.


The Cocoon by Sealy Chill mattress comes with a 10-year limited warranty. They’ll repair or replace the mattress for the original owner if it shows up with or eventually reveals manufacturing defects or material flaws that have nothing to do with wear and tear. That’s also assuming you’re using the right kind of foundation—a firm, solid-surface or adjustable base that can hold the mattress and the sleeper. Or a slatted base with at least 2-inch wide slats placed no more than 5 inches apart.

The warranty covers indentations of at least 1 inch, too. It doesn’t cover any damage you caused or any mattresses sold by resellers. 


You can get 0% financing for 12 months with the Cocoon by Sealy Credit Card.


You can only purchase the Cocoon by Sealy Chill mattress on the Cocoon by Sealy’s website and through Amazon.com.

Cocoon by Sealy Chill Mattress Rating and Conclusion

We here at Mattress Nerd give the Cocoon a 4.8/5. Back when Sealy introduced the original Cocoon, it wanted to give customers, who eagerly jumped into the online mattress arena, a great choice with the Sealy name on it. What they gave customers was an affordable, solid memory foam mattress, sold at the online hub for the mattress itself and shipped free in a compressed in a box to U.S. consumers.

Sealy can adapt easily to changing trends and does so here by adding a proprietary “phase-change” material into the cover fabric itself. The Chill model of Cocoon by Sealy uses that material to keep sleepers at a neutral temperature while they sleep. Sleepers avoid waking up, throwing the covers off if they’re too hot or shivering if they’re too cold. The material releases heat or retains it depending on which is your specific temperature challenge in bed.

Overall, the Cocoon by Sealy Chill Mattress ticks nearly all the boxes. It’s affordable. It’s serviceable. You have the option of two firmness levels. It’s made well. It’s backed by one of the three most recognizable names in the mattress business. If you’re into memory foam and need a bed to keep you cool, you could do a lot worse than the Chill model by Cocoon by Sealy.

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