The Casper Cooling Select is a cheap all-foam bed-in-a-box available exclusively at Costco U.S. This Medium mattress has a polyfoam support layer, zoned transition layer, and comfort layers of polyfoam and memory foam. All the foam layers are CertiPUR certified, meaning that they're lower in hazardous chemicals and heavy metals.
Our Verdict
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Light Weight
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Average Weight
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Heavy Weight
The Casper Cooling Select mattress is best suited to average- and heavier-weight side sleepers. If you fall into either of those categories, your shoulders and hips will sink far enough into the mattress to relieve pressure. Lighter-weight sleepers, on the other hand, won't compress the mattress enough, creating uncomfortable pressure on the shoulder. Regardless of your weight, you don't sink very far into the comfort layer, and they don't contour you very closely either, so lighter sleepers don't get much additional pressure relief here.
Fantastic body conformity for heavier-weight sleepers.
Great body conformity for average-weight sleepers.
Inadequate body conformity for lighter-weight sleepers.
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Light Weight
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Average Weight
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Heavy Weight
The Casper Cooling Select mattress is a good choice for lighter and heavier-weight back sleepers. It's supportive enough to keep the heavier parts of your body lifted, so your spine stays in a straight line. It's not quite as good for average-weight back sleepers. It still provides decent support for sleepers in this category, but depending on your preferences, you may want a mattress with sturdier support.
Good support for lighter and heavier-weight sleepers.
Decent support for average-weight sleepers.
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Light Weight
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Average Weight
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Heavy Weight
The Casper Cooling Select mattress is a good option for lighter and heavier-weight stomach sleepers. If you fall into either of these categories, this mattress will provide enough support to keep your back from arching. Average-weight sleepers will get a little less support. It's still a decent choice for sleepers in this category, but if you know you like a firmer feel, you may also want something more supportive.
Good support for lighter and heavier-weight sleepers.
Decent support for average-weight sleepers.
The Casper Cooling Select mattress is reasonably durable. The upper comfort layer is made of dense, high-quality polyfoam, while both the transition and support layers are made of good-quality polyfoam. The lower comfort layer, however, is made of low-density, low-quality memory foam, making it the weak point in the mattress. Overall, it will resist sagging longer than mattresses with only low-density foam, but not as long as those without any low-quality layers.
Uses mostly good- and high-quality foam, increasing durability.
Low-quality memory foam comfort layer may cause premature sagging.
The Casper Cooling Select mattress offers varying levels of pressure relief, depending on your weight category. It provides fantastic body conformity for heavier-weight sleepers who compress the mattress most. These sleepers will sink into the mattress enough to relieve pressure on the hips and shoulders when sleeping on their sides. It also provides great body conformity for people in the average-weight category, but lighter-weight sleepers won't compress the mattress enough, leading to uncomfortable pressure points. It's also not a very enveloping mattress, so regardless of your weight, you won't experience much sinking or contouring.
Fantastic body conformity for heavier-weight sleepers.
Great body conformity for average-weight sleepers.
Inadequate body conformity for lighter-weight sleepers.
The Casper Cooling Select mattress provides good support for most sleepers. If you're in the heavier or lighter weight categories, it keeps the heaviest parts of your body lifted, so your spine stays aligned. It's a bit less supportive for those in the average-weight category, and while it still offers decent performance, some back and stomach sleepers in this category may want a mattress with more robust support.
Good support for lighter and heavier-weight sleepers.
Decent support for average-weight sleepers.
The Casper Cooling Select mattress provides very good cooling, though it's not quite cooling enough for hot sleepers. Its cooling is less efficient at the start of the night, but after the first hour, it transfers heat more quickly, keeping you cool for the rest of the night.
Cooling enough for most people.
The Casper Cooling Select mattress does an excellent job of dissipating motion. You feel movement nearby, but it doesn't travel across the mattress, and it doesn't last long. So, if your sleeping partner rolls over, you feel it in the lumbar region, but only briefly, and you don't feel it throughout the rest of the mattress.
Excellent motion dissipation means movement is less likely to disturb you.
The Casper Cooling Select mattress is impressively responsive, making it easy to move around and switch sleeping positions. It's not very bouncy, which makes it a bit more difficult, but that's typical of a memory foam mattress.
Very responsive, so changing sleeping positions is easy.
Not very bouncy, which can leave you feeling 'stuck.'
Performance Usages
Changelog
- Updated Mar 09, 2026: We converted this review to Our Verdict section to clearly show the suitability of a mattress for your weight and sleeping position.
- Updated Feb 02, 2026: Review published.
- Updated Dec 18, 2025: Early access published.
- Updated Nov 18, 2025: Our testers have started testing this product.
Check Price
Differences Between Sizes And Variants
The Casper Cooling Select is available exclusively at Costco in four sizes: Full, Queen, King, and California King. They also carry a hybrid version under the same name, the Casper Cooling Select 12" Hybrid Medium Firm Mattress. We tested the Queen-sized all-foam version, and our results are only valid for that variant. See the label for our unit.
If you encounter another variant, let us know in the comments, and we'll add it to our review.
Popular Mattress Comparisons
The Casper Cooling Select is an affordable all-foam medium mattress available exclusively at Costco U.S. It's a pretty versatile mattress, which is suitable for most sleepers. However, it can't match the support or body conformity of the pricier Casper Snow, which is a better choice, especially for lighter-weight side sleepers. It's not quite as cooling as the Casper Snow either; it transfers heat effectively enough to keep most sleepers cool, but if you persistently sleep hot, it won't be effective enough. The Cooling Select doesn't offer as much contouring as many memory foam mattresses, so if you prefer a 'hugging' feel, the Nectar Premier might be a better fit. And if longevity is your priority, you should look for something with more layers of dense foam, like the Sleep On Latex Pure Green Organic, which uses high-quality latex. That being said, it's more durable than many pricier options, so if you're looking for an inexpensive, all-foam option that won't start sagging too soon, it's a surprisingly good pick.
To find out what we recommend, see the best mattresses, the best memory foam mattresses, and the best cooling mattresses.
The Casper Cooling Select is a better mattress than the Novaform Serafina Pearl. Both are medium all-foam mattresses, but the Casper offers better performance in a few areas. It's slightly more cooling, though neither option is quite cooling enough for hot sleepers. It's also more responsive, so it's easier to move around on. And it does a better job of isolating motion, so you'll feel less movement across the mattress, making it a better choice if you're a light sleeper or if you sleep with a partner.
The medium Casper Cooling Select is a better choice for most people than the medium-firm Novaform ComfortGrande Plus. The Casper offers a little more support and body conformity, making it more comfortable for a range of sleepers, though neither is a good choice for lighter side sleepers. The Casper is also a little more cooling and a lot more responsive, making it easier to change sleeping positions. On the other hand, the Novaform is better at isolating motion, so you may still prefer it if you or your sleeping partner tends to toss and turn.
The Helix Midnight Luxe 2025 and the Casper Cooling Select offer different benefits, and you may prefer either depending on your priorities. The Helix is a medium hybrid mattress that offers slightly better cooling, so it's a better choice if you sleep hot. It's also bouncier and more responsive, so it's easier to move around on. The Casper is a medium all-foam mattress with better motion isolation, so you may prefer it if you sleep with a partner who tosses and turns throughout the night.
The Casper Cooling Select and the DreamCloud Classic Hybrid have some significant differences, and either may be a good choice, depending on your preferences. The Casper is a medium all-foam mattress that stands out for its excellent motion dissipation. You'll feel less movement across the mattress, making it a good choice for partnered sleepers. It's also more durable, so it's less likely to start sagging prematurely. The DreamCloud is a medium-plush hybrid mattress with fantastic responsiveness, so it's easy to move around and change sleeping positions. It also has fantastic edge support, so you may prefer it if you like to sleep near the edge and don't want to worry about slipping off.
Test Results
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