Polysleep Sierra Mattress Review: Ratings From Our Test Lab
By
Jackson Lindeke
Jackson Lindeke
Executive Product Director
Jackson leads editorial product recommendations at Sleep Foundation, transforming the data from our sleep product test lab into real world takeaways for consumers. He has spent over half a decade developing protocol to evaluate and measure the impacts of products on sleep quality. As a cited sleep product expert, Jackson helps guide millions of shoppers to find personalized recommendations for everything from pillows to bedding to mattresses.
The Polysleep Sierra delivers deep body-contouring to help ensure ample cushioning for your body, even spinal alignment, and minimal pressure in your most sensitive areas. Our tests also show the mattress excels at motion isolation – this is thanks to an adaptive surface layer that absorbs movement well.
Ratings Summary
Motion Isolation
7/10
Edge Support
6/10
Temperature Control
4.5/10
Ease of Movement
4.5/10
Off Gassing
5/10
Pressure Relief
6/10
Pros
Budget-friendly price-point
Memory foam designed for antimicrobial protection
Medium firm (6) feel combines conforming and support
Motion-isolating foam limits vibrations when a sleep partner moves
Cons
Lack of bounce may make it harder to move on the surface
May retain some heat despite the use of memory foam designed for breathability
Likely to feel too firm to some sleepers under 130 pounds
Founded in 2016, Polysleep has a reputation for making some of the best mattresses in Canada. The company’s product line includes pillows, a mattress protector, a mattress topper, a foundation, and several mattress models. The Polysleep Sierra Mattress is the company’s most budget-friendly option, leveraging a pared-down design and manufacturing automation to cut costs.
Other models include the Polysleep Mattress, the Polysleep Origin 2.0, the Polysleep Aura, and the Polysleep Zephyr. Each of these options has a higher-profile design with more foam layers than the Polysleep Sierra. However, they all share a medium firm (6) feel and all-foam construction. It’s also worth noting that Polysleep also makes an RV mattress and a thinner, one-layer mattress that folds into a couch.
We’ll share the results of our in-house testing, detailing its performance and which team members found the Polysleep Sierra most comfortable. In addition, we’ll explain the construction and how the design impacted our performance findings. Finally, we’ll share the pricing and policy information that you might want to know before you buy.
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Testing Team Takeaways
To test the Polysleep Sierra, we had three people on our testing team each take the bed home with them for one week. Here are their initial observations.
Jackson Lindeke
Executive Product Director
Side sleeper
180 pounds
Showers before bed
There’s a lot to like about the Polysleep Sierra if memory foam is your preferred mattress type. I definitely felt well-cushioned lying on my side. That said, this bed’s just a bit too soft for me.
Jeremy Klein
Senior Product Testing Manager
Side sleeper
160 pounds
Nightly melatonin user
I think I felt more comfortable on the Polysleep Sierra than Jackson did, but there was a bit of sink beneath my midsection. At the same time, the Sierra didn’t cause any extra pain or pressure to build anywhere.
Colin Simpson
Product Research Manager
Side sleeper
190 pounds
Talks in sleep (like a lot)
While I agree that this mattress felt a bit soft, there’s also a lot to like about the Sierra. Motion isolation is a strong point we noticed during our tests and, from a practical perspective, the mattress is super lightweight and easy to move.
Sleeping Style and Body Weight
Polysleep Sierra
Sleeper Type
Under 130 lbs
130-230 lbs
Above 230 lbs
Side Sleepers
5/10
7/10
7/10
Back Sleepers
5/10
7/10
7/10
Stomach Sleepers
4.5/10
6.5/10
6.5/10
Side Sleepers
The Polysleep Sierra Mattress is a good option for most side sleepers. The best mattress for side sleepers typically molds to their hips and shoulders to spread out pressure, and the Polysleep Sierra’s memory foam comfort layer does just that. While the medium firm (6) feel doesn’t offer the deep cradling some side sleepers look for, many find it to be more than comfortable.
Among our side-sleeping testers, those over 130 pounds found the mattress most comfortable. They reported a good balance between contouring and support, which let their hips and shoulders sink in without sagging. Our testers under 130 pounds couldn’t sink in as deeply, so they experienced some pressure buildup around their hips and shoulders.
Back Sleepers
Back sleepers looking for even support that cradles their lumbar regions can find it in the Polysleep Sierra Mattress. Its memory foam comfort layer lets the hips sink in just enough to mold to the lower back and promote good sleep posture.
Our team members over 130 pounds felt the Polysleep Sierra Mattress kept their spines on a relatively even plane, allowing them to lie comfortably on their backs. Testers under 130 pounds felt the mattress was a bit too firm. While they could lie on their backs without too much discomfort, they would have preferred more conforming around their hips and lower backs.
Stomach Sleepers
While the Polysleep Sierra Mattress may not provide optimal support for most stomach sleepers, many will still find it comfortable. The memory foam comfort layer molds enough to the body to soften the feel of the surface. Meanwhile, the medium firm (6) feel offers enough support to limit sagging around the midsection for most stomach sleepers, which is a common problem for this group.
We determined that the Polysleep Sierra Mattress was most suitable for stomach sleepers over 130 pounds. They found the surface nearly as comfortable as our back and side sleepers in this weight group, making the model a good option for combination sleepers over 130 pounds. Testers under 130 pounds reported that the mattress felt a bit too hard for them to fully relax.
Mattress Performance
In addition to the hands-on feedback from our team, we conduct a number of quantitative tests in our Test Lab. The below ratings are based on the experience of our testers.
Motion Isolation
7
/ 10
“Both of the Sierra’s foam layers absorb movement well, so you shouldn’t notice much motion transfer from your partner, and vice versa. We noticed very little bounce from the memory foam.” – Jackson
Thanks to its memory foam comfort layer and all-foam construction, the Polysleep Sierra Mattress absorbs movement well.
The majority of sleepers probably won’t feel when their partner gets up or changes position during the night. However, a sleeper who is sensitive to movement may notice some vibrations spread across the surface, particularly if their partner is prone to tossing and turning.
We used a vibrational sensor for objective data and asked testers to give us their subjective feedback. In both instances, we found that minimal to moderate motion transferred to the opposite side of the bed when we dropped a kettlebell on the surface or when testing partners moved around.
Pressure Relief
6
/ 10
“Since the Sierra is an all-foam mattress, it does a solid job at relieving pressure if you sleep on your side or weigh more than 130 pounds.” – Jeremy
The Polysleep Sierra Mattress relieves pressure moderately well. In contrast, the best memory foam mattresses typically offer more significant pressure relief.
While the Polysleep Sierra Mattress’ 2-inch memory foam comfort layer redistributes pressure to an extent, it isn’t deep enough to offer exceptional pressure relief for many individuals. Sleepers over 130 pounds may press against the firmer core. Meanwhile, those under 130 pounds may not sink deeply enough to experience pressure-relieving contouring.
Temperature Control
4.5
/ 10
“There’s some noticeable heat buildup on the Polysleep Sierra – despite an open-cell composition, the memory foam absorbs and holds on to a fair amount of warmth. Cooling sheets might be a smart investment if you choose this mattress.” – Colin
While the Polysleep Sierra Mattress incorporates open-cell memory foam engineered for breathability, the model itself is not designed as a cooling mattress.
Its open-cell memory foam allows for more air circulation than a lot of more traditional memory foam, but the close hug can still trap the sleeper’s heat against their body. Additionally, the polyfoam core doesn’t allow much airflow to help heat dissipate.
Our thermal imaging and laser thermometer readings showed that heat lingered on the surface after a heat source was removed. Testers also noted that the mattress felt warmer the longer they lay on it.
Edge Support
6
/ 10
“The Sierra’s edge support is comparable to the average memory foam mattress – which is to say, somewhat weak. You may notice some compression when getting in and out of bed.” – Jackson
The Polysleep Sierra Mattress’ edge support is on par with many all-foam models. Because of its medium firm (6) feel, the bed is inherently fairly supportive. Additionally, sleepers don’t have to sink in very far to reach the supportive polyfoam core since the comfort layer is relatively thin. This means that sleepers can use more of the surface and sit along the edge more securely.
Most of our testers could sit or lie along the edge of the mattress without feeling like the bed was buckling out from under them. However, some over 230 pounds felt less stable.
Ease of Movement
4.5
/ 10
“The Sierra’s memory foam hinders movement, and this can make you feel a bit stuck when getting in and out of bed or changing sleep positions. People who weigh at least 130 pounds won’t struggle as much, though.” – Jeremy
Like many all-foam models, the Polysleep Sierra Mattress lacks bounce and retains the sleeper’s shape, which can inhibit movement. The polyfoam core lacks the springy responsiveness of traditional coil-based models. Additionally, the memory foam comfort layer holds a lingering impression when the sleeper changes positions, which can create the feeling of being stuck in the bed.
While this probably won’t be a problem for most individuals, sleepers with mobility issues may find it more challenging.
Our team members were able to change positions without a lot of effort, but those over 230 pounds found it slightly more difficult than their counterparts.
Off-Gassing
5
/ 10
“The Sierra’s off-gassing odor is pretty strong for the first 24 hours, and then it gradually tapers off until it isn’t noticeable anymore. Expect the smells to linger for up to three days, but they shouldn’t impact sleep beyond the first night.” – Colin
The Polysleep Sierra Mattress has an initial new mattress smell that may linger for a few days after you unpack it. Most models that contain synthetic foam also off-gas due to volatile organic compounds (VOCs) from manufacturing that haven’t had time to escape the material.
VOCs are not thought to be harmful, but some people don’t like the smell. If you’re sensitive to smells, letting your mattress air out in a different room before use can help you avoid it.
That said, the Polysleep Sierra Mattress holds CertiPUR-US certification, which is a third-party standard that confirms the material is low in VOCs and free from certain harmful substances.
We found that the Polysleep Sierra Mattress had a moderate odor when we unpacked it, but the smell had mostly dissipated after 48 hours.
The Polysleep Sierra Mattress is a medium firm (6) foam model. It measures 9 inches thick, which makes it slightly thinner than standard-profile models.
A soft polyester cover wraps around the surface. It is zippered and removable for easy access to the interior of the mattress.
The comfort layer consists of 2 inches of memory foam. This material molds to the shape of the sleeper to limit pressure buildup by spreading out the force of their weight more evenly. It also contributes to a gentle hugging sensation, though this close-conforming can trap heat against the sleeper’s body. In an attempt to counteract that, the Polysleep Sierra Mattress uses open-cell memory foam designed for more air circulation than standard memory foam. The memory foam comfort layer is also engineered to be antimicrobial to protect against bacterial buildup.
A 7-inch polyfoam core supports the sleeper.
The mattress holds ISO 20743 certification to confirm its antibacterial properties. It also holds CertiPUR-US certification, which verifies it is free from formaldehyde, mercury, lead, and certain other potentially harmful substances.
Firmness
Medium Firm (6)
Mattress Type
Foam
Construction
The Polysleep Sierra Mattress consists of a layer of open-cell memory foam and a layer of polyfoam encased in a removable polyester cover.
Cover Material:
Polyester
Comfort Layer:
2″ Memory foam (open-cell)
Support Core:
7″ Polyfoam
Mattress Sizing
The Polysleep Sierra Mattress comes in four of the standard mattress sizes. Twin XL and California king are not available.
Sizes
Dimensions
Height
Weight
Twin
39″ x 75″
9″
36.5 lbs.
Full
54″ x 75″
9″
52.5 lbs.
Queen
60″ x 80″
9″
64.1 lbs.
King
76″ x 80″
9″
64 lbs.
Trial, Warranty, and Shipping Policies
Availability
The Polysleep Sierra Mattress is available through the official Polysleep website. Note that Polysleep has separate websites for Canadian and American customers.
Customers can also purchase the Polysleep Sierra Mattress through Amazon. Additionally, Polysleep products are available at select third-party brick-and-mortar retail partners across Canada. However, note that different policies may apply to purchases outside of the official website.
Shipping
Orders of the Polysleep Sierra Mattress directly through the company ship to customers in the contiguous U.S. and Canada. Shipping is free for the contiguous U.S. states and the Canadian provinces. Fees apply to orders to the Canadian territories. Mattresses typically ship via UPS, FedEx, Canada Post, or Canpar.
Most orders take one or two business days to process and arrive between two and seven business days later. In total, customers can usually expect to receive their mattress between four and nine days after placing their orders.
The mattress ships to your door or wherever you ordinarily receive large packages. It is typically encased in a 17-inch by 17-inch by 41-inch box. The new owner is then responsible for bringing it into their home and unpacking it in their room of choice. To unpack the mattress, owners should slide the mattress out of the box, unroll it, and then carefully cut away and remove the plastic wrapping. While the mattress should be ready to use right away, it may take 24 to 72 hours to fully expand.
Additional Services
White Glove delivery and old mattress removal are not available.
Sleep Trial
When purchased directly from Polysleep, the Polysleep Sierra Mattress comes with a 100-night sleep trial. After you’ve tried the mattress for at least 45 nights, you can initiate a return if you decide it’s not right for you. A return fee of $90 plus taxes applies, which will be deducted from your refund. Each household is eligible for only one return under the trial policy. Returned mattresses are typically donated or recycled.
Alternatively, a mattress in an unopened box can be returned for $46 plus taxes.
Note that this policy does not apply to the Canadian territories.
Warranty
The Polysleep Sierra Mattress comes with a five-year limited warranty. It gives the original consumer purchaser recourse should their Sierra Mattress purchased from Polysleep or an authorized Canadian dealer have an eligible defect.
Qualifying defects include deterioration resulting in visible indentations or sagging over .75 inches deep, physical flaws leading to splits or cracks in the foam, and defects in the cover’s zipper.
If an eligible defect arises, Polysleep offers a one-time repair or replacement for no fee. However, the warranty does not cover costs associated with transportation or inspection.
The mattress must be used normally and for its intended purposes on an appropriate bed base. Damage due to abuse, misuse, or improper handling doesn’t qualify.
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Jackson leads editorial product recommendations at Sleep Foundation, transforming the data from our sleep product test lab into real world takeaways for consumers. He has spent over half a decade developing protocol to evaluate and measure the impacts of products on sleep quality. As a cited sleep product expert, Jackson helps guide millions of shoppers to find personalized recommendations for everything from pillows to bedding to mattresses.
