SEALY® Cocoon™ 10" Plush Memory Foam Mattress - King

Comfort IQ™ · Scored on what actually matters

SEALY® Cocoon™ 10″ Plush Memory Foam Mattress — Performance & Feel

Comfort IQ™ scores eight dimensions 0–10 from National Mattress's in-house testing + construction — the same scale on every model, so two beds compare on what actually matters. Results vary by body type, base, and room temperature.

The Sealy Cocoon 10″ Plush is built for deep, cushioning pressure relief — it scored a 9.7, among the best we record, with a soft memory-foam surface that wraps the shoulders and hips. At a plush 1-out-of-10 feel it delivers the genuine pillowy, sink-in memory-foam experience lighter side sleepers love, and it isolates motion exceptionally for a dead-quiet night. For side sleepers who want maximum cushion and the classic enveloping memory-foam hug, shipped right to the door, this is a top pick.

Performance Scores

In National Mattress's in-house Comfort IQ analysis, the Cocoon Plush scores: Overall 8.4/10, Cooling 9.3/10, Pressure Relief 9.7/10, Motion Isolation 8.4/10, Edge Support 8.3/10, Responsiveness 10.0/10, Spinal Support 4.0/10, Durability 7.8/10.

Best For

Considerations

How It Performs — The Measured Detail

Feel & Firmness · 1/10 Plush

This is a deeply plush bed: the 2 inches of soft memory foam create an immersive, fully-enveloped feel where you settle in and the surface rises up around you. It is the genuine pillowy, melt-into-the-bed sensation memory foam is known for, at the softest end of the scale. Expect to sink in and feel cradled rather than supported on top.

Cooling 9.3

Cooling scored an unusually strong 9.3 for a bed this soft. In-house testing put the peak surface temperature in the 30.2-33.0 °C range with the rise over baseline in the 8.2-11.0 °C band, settling toward a 25.2-29.4 °C resting temperature. The honest caveat is the deep cradle: the more your body sinks in, the more foam surrounds and insulates you, and an all-foam core does not move air the way coils do. The stretch-knit cover helps at the surface, but the immersive hug that defines this plush bed naturally holds some heat. Hot sleepers who love a soft feel should know that trade-off going in.

Pressure Relief 9.7

Pressure relief is this bed's signature strength, scoring 9.7, among the best we record. In-house measured sinkage of 1.41-2.96 inches sits well into deep-cradle territory, producing an immersive, fully-enveloped feel. At a plush firmness of 1 out of 10, the 2 inches of soft memory foam wrap closely around the shoulders and hips, letting the sharpest pressure points sink in until weight is spread broadly rather than concentrated. For lighter side sleepers and anyone who suffers from shoulder or hip pressure, this kind of deep, cushioning give is exactly what relieves it — the genuine pillowy memory-foam experience.

Motion Isolation 8.4

If undisturbed sleep next to a restless partner is what you are after, this bed delivers, scoring 8.4. In-house testing registered motion acceleration in the 2.00-3.65 m/s² range with a settle time of 0.50-0.71 seconds, well below the typical mattress, so a partner shifting or getting up barely registers on your side. The deep, soft memory foam is ideal for this: it absorbs movement completely instead of carrying it, and with no coils there is no path for energy to travel across the bed. Couples and co-sleepers get about as much motion isolation as a mattress can deliver.

Edge Support 8.3

This is the softest edge of the Cocoon beds, and the plush all-foam build makes that unavoidable. In-house measured edge sinkage of 2.81-6.39 inches means the perimeter gives substantially when you sit on the side or sleep right at the rim. With a 1-out-of-10 plush feel and no coil or encasement to reinforce the edge, the same soft memory foam that creates the deep body cradle also collapses readily under concentrated weight. Sleepers who stay toward the center will not be affected; if you sit on the edge to dress or need the full width to feel firm, this is the bed's most pronounced compromise.

Responsiveness 10.0

This surface yields with a slow, sink-in melt, and despite the depth it earned a perfect 10.0 for recovering cleanly. In-house testing measured total bounce travel of 6.09-8.61 inches, reflecting memory foam's deliberate, non-springy character: it gives gradually and cradles rather than pushing back. The surface mostly recovers within a 0.22-2.46 second window after weight lifts, so the deep hug never feels stuck. The feel is enveloping and supportive, that classic hug that lets you settle deeply into one position. If you adore the sensation of melting into the bed, this plush boxed bed is a perfect match.

Off-Gassing 8.0

Off-gassing is well managed, clearing in the 12-24 hour range, well under typical for a roll-packed plush memory-foam mattress. The foams are CertiPUR-US certified, independently tested for low VOCs, and the bed is made locally in Ontario and ships within days rather than spending months compressed like many imported brands. That brief time under compression means little trapped scent, so any faint new-foam smell clears within a day or two of airing out after you unbox it.

Sleep Position & Body Weight Fit

Lighter side sleepers are the ideal fit — the plush 1/10 feel and 9.7 pressure relief cradle the shoulders and hips, and a lighter body displaces less foam so alignment stays reasonable. The honest limit is heavier sleepers and dedicated back or stomach sleepers: with a 4.0 spinal score, the deep cradle lets the midsection sink too far to keep the spine neutral, so a firmer or coil-based bed is the better choice for them.

At a Glance

Full construction, per-size dimensions and layer details are in the product description above. View 365-night trial details.

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