Living Review Two-lab audit

Casper Cooling Select Memory Foam Mattress ReviewCostco’s all-foam Casper, measured twice

This Casper Cooling Select Memory Foam mattress review covers the 12-inch all-foam model, not the Hybrid sold beside it at Costco. NapLab and RTINGS each tested it, and where their numbers disagree, both are shown.

Updated 2026-11-04 · By SleepUnpacked Research Team

Quick Verdict

Is the Casper Cooling Select Memory Foam worth buying?

Yes for couples and back sleepers who already hold a warehouse membership. Motion isolation is excellent in both labs (9.6/10 at NapLab, 8.6/10 at RTINGS), back sleepers scored in the mid-7s at every weight, and the queen is $649.99 online. No for hot sleepers: NapLab measured a 91.8°F peak, warmer than average, so the “Cooling” name fits the Hybrid better. Light side sleepers, edge sitters and anyone sensitive to a 15-day odor should also look elsewhere.

Decision and purchase facts

Casper Cooling Select Memory Foam at a glance

Exact model: Casper Cooling Select 12" Memory Foam (Costco)
Type: All-foam (memory foam comfort layer)
Firmness: Medium (retail label)
Height: 12 inches
Price: $649.99 queen (online)
Trial: Costco satisfaction guarantee
Delivery: Threshold delivery in a compact box
Returns: Return to any Costco warehouse
Warranty: 10-year limited warranty

Best for

• Costco members who want the Cooling Select feel for $100 less than the Hybrid’s queen list price.
• Couples: NapLab scored motion isolation 9.6/10 and RTINGS scored motion dissipation 8.6/10.
• Back sleepers of any weight — both labs scored back sleeping in the mid-7s across their weight groups.
• Shoppers who want a quiet bed with no coils and a no-fuss Costco return.

Avoid or test carefully if

• You sleep hot: NapLab measured a 91.8°F peak, warmer than its 89.7°F average, and RTINGS says it sheds heat slowly at bedtime.
• You are a light side sleeper: RTINGS scored side sleeping for light sleepers only 5.8/10.
• You sit on the edge to dress: NapLab measured 6.00 inches of seated edge sinkage against a 4.06-inch average.
• You are sensitive to smells: NapLab recorded a strong odor for 15 days.

Best-for and avoid-if guidance is Sleep Unpacked editorial analysis. Purchase terms can change; use the linked official source before ordering.

Comparable performance matrix

What the evidence says—and does not say

Each result is labeled by evidence type. A measurement is not converted into a 10-point rating, and an untested metric stays unscored.

Firmness

Measured data

6/10 (NapLab); 42 Pa/mm, Medium (RTINGS)

Two labs, two methods, one answer: a medium bed that feels medium-firm because the foam lets you sink only a little.

RTINGS firmness test

Pressure relief

Measured data

1.91 in sinkage, 8.0/10 (NapLab); 7.3/10 (RTINGS)

Shallow, even contour. Good for back and heavier side sleepers; RTINGS found light side sleepers do not sink far enough for full shoulder relief.

NapLab test

Cooling

Measured data

91.8°F peak vs 89.7°F average, 7.0/10 (NapLab); 7.9/10 (RTINGS)

The weakest result for a bed named “Cooling.” It runs warmer than average at first; RTINGS saw heat transfer improve later in the night.

NapLab test

Motion isolation

Measured data

9.6/10, settles in 0.71 s (NapLab); 8.6/10 (RTINGS)

The clearest strength. A partner’s movement stays close to where it starts and fades fast.

NapLab test

Response / bounce

Measured data

0.4 s mostly recovered, 1.2 s fully; 6.66 in bounce (NapLab)

Quick enough to turn over without feeling stuck, but low bounce: 6.66 inches against a 9.33-inch average. RTINGS scored responsiveness 8.3/10.

NapLab test

Edge support

Measured data

6.00 in seated sinkage; lying edge “Good” (NapLab); 7.7/10 (RTINGS)

Fine to lie near the edge, weak to sit on it. Neither lab found a reinforced perimeter, and NapLab noted a slippery cover.

NapLab test

Noise

Measured data

Minimal (NapLab)

All foam and no coils, so there is nothing to squeak. NapLab rated noise minimal.

NapLab test

Metric	Result	Evidence	Interpretation
Firmness	6/10 (NapLab); 42 Pa/mm, Medium (RTINGS)	Measured dataRTINGS firmness test	Two labs, two methods, one answer: a medium bed that feels medium-firm because the foam lets you sink only a little.
Pressure relief	1.91 in sinkage, 8.0/10 (NapLab); 7.3/10 (RTINGS)	Measured dataNapLab test	Shallow, even contour. Good for back and heavier side sleepers; RTINGS found light side sleepers do not sink far enough for full shoulder relief.
Cooling	91.8°F peak vs 89.7°F average, 7.0/10 (NapLab); 7.9/10 (RTINGS)	Measured dataNapLab test	The weakest result for a bed named “Cooling.” It runs warmer than average at first; RTINGS saw heat transfer improve later in the night.
Motion isolation	9.6/10, settles in 0.71 s (NapLab); 8.6/10 (RTINGS)	Measured dataNapLab test	The clearest strength. A partner’s movement stays close to where it starts and fades fast.
Response / bounce	0.4 s mostly recovered, 1.2 s fully; 6.66 in bounce (NapLab)	Measured dataNapLab test	Quick enough to turn over without feeling stuck, but low bounce: 6.66 inches against a 9.33-inch average. RTINGS scored responsiveness 8.3/10.
Edge support	6.00 in seated sinkage; lying edge “Good” (NapLab); 7.7/10 (RTINGS)	Measured dataNapLab test	Fine to lie near the edge, weak to sit on it. Neither lab found a reinforced perimeter, and NapLab noted a slippery cover.
Noise	Minimal (NapLab)	Measured dataNapLab test	All foam and no coils, so there is nothing to squeak. NapLab rated noise minimal.

Position × body weight

Who should—and should not—choose it

These calls combine NapLab's yes/no position-by-weight verdicts with RTINGS' scores for light, average and heavy sleepers. Where RTINGS scored a group low, the cell drops even if NapLab said yes.

Side

Under 150 lb

Use caution

RTINGS scored light side sleepers 5.8/10: too little sink at the shoulder. NapLab still lists it as a fit.

150–250 lb

Recommended

RTINGS scored average-weight side sleepers 7.8/10, and NapLab recommends it in this band.

Over 250 lb

Possible fit

RTINGS scored heavy side sleepers 8.5/10, but NapLab suggests a more supportive bed above 250 lb.

Back

Under 150 lb

Recommended

RTINGS scored light back sleepers 7.5/10 and the shallow sink keeps the spine level.

150–250 lb

Recommended

Both labs recommend it here; the zoned layer is firmer under the lower back.

Over 250 lb

Possible fit

RTINGS scored heavy back sleepers 7.5/10, but an all-foam core with no coils is the limit NapLab flags above 250 lb.

Stomach

Under 150 lb

Recommended

RTINGS scored light stomach sleepers 7.6/10; little sinkage keeps hips up.

150–250 lb

Possible fit

RTINGS scored this group 7.3/10. A medium feel can let hips dip as weight rises.

Over 250 lb

Use caution

Stomach sleeping puts the most load on the hips, and NapLab advises a more supportive bed above 250 lb.

Combination

Under 150 lb

Possible fit

Recovers in 0.4 seconds, but the low bounce makes turning a little slower than on a hybrid.

150–250 lb

Possible fit

Easy enough to change position; side comfort is good in this band, so most combinations work.

Over 250 lb

Use caution

Each position weakens above 250 lb, and low bounce adds effort to every turn.

Sleep position	Under 150 lb	150–250 lb	Over 250 lb
Side	Use caution RTINGS scored light side sleepers 5.8/10: too little sink at the shoulder. NapLab still lists it as a fit.	Recommended RTINGS scored average-weight side sleepers 7.8/10, and NapLab recommends it in this band.	Possible fit RTINGS scored heavy side sleepers 8.5/10, but NapLab suggests a more supportive bed above 250 lb.
Back	Recommended RTINGS scored light back sleepers 7.5/10 and the shallow sink keeps the spine level.	Recommended Both labs recommend it here; the zoned layer is firmer under the lower back.	Possible fit RTINGS scored heavy back sleepers 7.5/10, but an all-foam core with no coils is the limit NapLab flags above 250 lb.
Stomach	Recommended RTINGS scored light stomach sleepers 7.6/10; little sinkage keeps hips up.	Possible fit RTINGS scored this group 7.3/10. A medium feel can let hips dip as weight rises.	Use caution Stomach sleeping puts the most load on the hips, and NapLab advises a more supportive bed above 250 lb.
Combination	Possible fit Recovers in 0.4 seconds, but the low bounce makes turning a little slower than on a hybrid.	Possible fit Easy enough to change position; side comfort is good in this band, so most combinations work.	Use caution Each position weakens above 250 lb, and low bounce adds effort to every turn.

Fit calls are editorial readings of two third-party labs, not clinical advice. The warehouse return policy is the practical backstop.

Memory Foam vs Hybrid

Which Cooling Select should you buy?

Same name, same store, different beds. The foam model saves about $100 and isolates motion well. The Casper Cooling Select Hybrid mattress review covers the coil version, which NapLab measured 4°F cooler at peak with a much firmer seated edge.

Measure	Memory Foam	Hybrid
Build	Four foam layers, no coils	Foam over a 5.75-inch pocketed coil unit
Height	12 in (NapLab), 11.8 in (RTINGS)	11.75 in (NapLab)
Queen price	$649.99 online (checked 2026-11-04)	$749.99 list (checked 2026-10-20)
NapLab peak surface temperature	91.8°F (warmer than average)	87.8°F (cooler than average)
NapLab sinkage	1.91 in	1.89 in
NapLab seated edge sinkage	6.00 in	3.50 in
Odor in NapLab testing	Strong, 15 days	Strong, 15 days
Warranty	10-year limited	10-year limited

Hybrid figures come from its own Living Review. Prices were checked on different dates; confirm the member price before you buy.

Where the labs disagree

Two test rigs, two different stories on heat and edges

Heat: 7.0 vs 7.9

NapLab records the hottest point a heated body form reaches on the surface: 91.8°F here, two degrees above its fleet average. RTINGS tracks how fast warmth moves away over a whole session. Its curve starts slow, then catches up. Read together, the bed feels warm when you first lie down and less so by the middle of the night.

Edges: weak vs good

NapLab presses a seated load onto the rim and measures the drop: 6.00 inches, about 50% deeper than its average. RTINGS weighs how much of the surface stays usable when lying down, and scored 7.7. Both are right. Sleeping near the perimeter is fine; perching there to tie shoes is not.

Where the rigs agree (firmness, sinkage, motion), the numbers in the performance table carry more weight. Where they split, the table shows both so you can decide which test matches how you use a bed.

What is inside

Four foams, one weak link

RTINGS cut the bed open and found 1.5 inches of dense poly foam on top, 1.5 inches of memory foam under it, a 1.4-inch zoned transition layer, and a 7.5-inch poly foam core. The zoned layer is slightly denser under the lower back (1.81 lb/ft³) than at the head and feet (1.69 lb/ft³). RTINGS rated the top poly foam high quality and the memory foam low density, which is why it flags that layer for body impressions. NapLab’s teardown labels the top two layers as memory foam; the retail listing’s order (breathable top, memory foam, zoned support, base) matches RTINGS.

Check the label before you buy

The listing shows item 1748799. The NapLab unit’s law tag reads 880-000071; the Hybrid’s reads 880-000082. Older reviews of the discontinued Select line, and any model sold on the brand’s own site, describe different mattresses. If the listing says “Hybrid” or mentions coils, this review does not apply.

Living Review durability forecast

Where will it wear first?

Assumptions: one or two adults under 250 lb, nightly use, a solid foundation and rotation every few months. This forecast reasons from the RTINGS foam densities; it is not a measured lifespan or a score.

First to change

The low-density memory foam layer. RTINGS names it as the part most likely to hold a permanent impression where hips and shoulders rest.

What helps

Shallow 1.9-inch sinkage spreads load, and the dense top poly foam shields the memory foam. RTINGS expects it to outlast beds built only from low-density foam.

Update trigger

RTINGS scored longevity 6.7/10. This forecast changes if either lab retests a newer unit, Costco changes the law-tag model, or long-term owner measurements appear.

Frequently Asked Questions

Is the Casper Cooling Select Memory Foam the same as the Cooling Select Hybrid?

No. The two beds share a name and a warehouse aisle. The Memory Foam model (item 1748799, law tag 880-000071) is four layers of foam with no coils. The Hybrid (law tag 880-000082) puts foam over a 5.75-inch pocketed coil unit, costs about $100 more for a queen, and tested cooler and firmer at the edge.

Does the Casper Cooling Select Memory Foam sleep cool?

Not especially. NapLab measured a 91.8°F peak surface temperature, warmer than its 89.7°F average, and scored cooling 7.0/10. RTINGS scored it 7.9/10 and found it sheds heat slowly at bedtime before improving. Hot sleepers will do better on the Hybrid, which NapLab measured at 87.8°F.

How firm is the Casper Cooling Select Memory Foam?

Costco labels it Medium. NapLab rated it 6/10, and RTINGS measured 42 Pa/mm, which it calls Medium but says feels medium-firm. You sink about 1.9 inches, so it feels like lying on the bed more than in it.

Is it good for couples?

Yes, that is its best result. NapLab scored motion isolation 9.6/10 with movement settling in 0.71 seconds, and RTINGS scored motion dissipation 8.6/10. All-foam also means no coil noise. The trade-off is weak seated edges, which matters when two people share the usable surface.

What are the Costco return and warranty terms?

There is no branded sleep trial. The store’s 100% satisfaction guarantee applies, with exceptions in its return policy, and online orders can be returned to any warehouse. NapLab lists a 10-year limited warranty; the retail listing tells members to ask the store for warranty details. A membership is required to buy.

How long will the Casper Cooling Select Memory Foam last?

No one has measured this model over years. RTINGS scored longevity 6.7/10 and named the memory foam comfort layer as the part most likely to take a permanent body impression. Expect the comfort layers to soften before the 7.5-inch support core. Treat this as a forecast, not a measured lifespan.

Sources and Review Notes

Costco listing — Casper Cooling Select 12" Memory Foam — Item number, queen price, Medium firmness label, 12-inch height, four-layer description, delivery and return terms. Checked 2026-11-04; member promotions change often.
NapLab Casper Cooling Select (all-foam) test — Updated May 18, 2026. Law-tag model 880-000071, manufactured 11/2024. Source of the temperature, sinkage, motion, response, edge, odor and position-by-weight results.
RTINGS Casper Cooling Select (foam) test — Bought October 2025, published February 2026, updated September 2026 (methodology v1.2). Source of the firmness (Pa/mm), category scores, layer teardown with foam densities and the 6.7/10 longevity score.
SleepUnpacked methodology — The two labs labeled the top layers differently; this review follows the RTINGS teardown, which matches the layer order on the Costco listing. The durability outlook is a forecast from foam densities, not an observed result.

Compare the Casper Cooling Select Memory Foam

Intro:For first-pass context, review Casper Cooling Select Hybrid mattress review.

Methods:For methods and material assumptions, review memory foam vs hybrid lab scores.

Methods:For methods and material assumptions, review best memory foam mattress picks.

Risk:For risk thresholds and failure conditions, review memory foam VOC and off-gassing safety.

Conclusion:For conclusion-level comparison, review mattress lifespan by construction.

Next Step:For your next decision step, review Saatva Loom & Leaf premium foam review.

Next Step:For your next decision step, review Casper Cooling Select Memory Foam specs, sizes & pricing.