Cocoon by Sealy Chill Memory Foam review

The Cocoon by Sealy Chill is a 10" memory foam bed from Sealy's online brand. It has a phase-change-material cooling cover over memory foam, responsive comfort foam and a support foam base. Tom's Guide rates it 6.5 out of 10, a medium-firm feel. This Cocoon by Sealy Chill review finds it one of the few budget all-foam beds that hot sleepers can consider. It's also a good fit for back and combination sleepers and couples. Heavier sleepers and people who want bounce should look elsewhere.

Best for: Back sleepers · Combination sleepers · Hot sleepers · Couples · Budget

Cocoon Chill feel and firmness

A 6.5 out of 10 is a classic medium-firm. You get a memory foam sink at the shoulders and hips, and the responsive foam and base stop you from bottoming out. It's a single-feel bed, so you can't choose softer or firmer.

The phase-change cover is the Chill's standout feature. It absorbs heat as it warms, which is why the surface feels cool when you first lie down. The memory foam underneath can still hold some warmth over a long night, but the cover makes this one of the coolest-feeling budget foam beds in our data.

Best (and worst) sleeping positions

Back sleepers get balanced support with enough contouring for the lower back. Combination sleepers do fine, though the slow memory foam makes turning over a little harder. Side sleepers under about 200 lbs often find 6.5 comfortable, with pressure relief at 4/5. Stomach sleepers usually need a 7 or above. Heavier sleepers may find a 10" all-foam bed too thin over time.

Cooling, motion and edges

Cooling is the reason to buy. Tom's Guide rated it highly, and we score it 5 out of 5. The phase-change cover feels cool, which is rare for a budget foam bed. Motion isolation is also a 5. Edges are a 3, so the perimeter compresses when you sit there.

Price, trial and warranty

Cocoon's site blocked automated checks, so our figures come from Tom's Guide (2025): about $599 for a queen at list price and often around $399 on sale. An older TechRadar article showed a much higher price, so confirm on cocoonbysealy.com. You get a 100-night trial and a 10-year warranty.

Sealy's backing is a point in its favor if you're wary of unknown budget brands. Still, our pricing data for this bed is older than for most others here. Check the current queen price, trial terms and any bundled extras before you compare it with the Zinus or Siena.

How it compares

The Zinus Green Tea is a little cheaper and softer, but it sleeps warmer. The Nectar Classic is firmer (7.5/10) with 5/5 edges and longer policies, so it's better for stomach sleepers. If you want a cool all-foam bed with more pressure relief and don't mind paying more, the grid-topped Purple Mattress is worth a look. The Chill also appears in our best cooling mattress guide.

If you're not sure this is your bed, the 60-second mattress-matching quiz builds a shortlist from your sleep position, weight and budget.

Specs at a glance

Specs and prices checked Oct 7, 2026 from Cocoon by Sealy’s site and independent reviews. They change — confirm before you buy. How we rate mattresses.

Where it ranks

• Best affordable cooling mattress — The Best Affordable and Budget Mattresses Under $1,000
• Best budget cooling mattress — The Best Cooling Mattresses for Hot Sleepers
• Best cooling mattress in a box under $500 — The Best Mattress in a Box for Every Sleeper and Budget
• Best cooling memory foam mattress — The Best Memory Foam Mattresses

Similar firmness

Prices are approximate queen prices when we last checked and change often. Ratings are 1–5 from published specs and independent test results — see how we score.