Polysleep Sierra Review (2025)
Updated: December 20, 2024
Grace Struth
Sleep Content Lead
Our Rankings
Edge support and motion isolation are factored into our overall mattress ratings. These scores are shown in green (scores of 5.0+), yellow (3.0–4.9), or red (2.9 and below). Firmness, bounce, and cooling features are a matter of personal preference and aren’t part of our rating system, so these scores are shown in grey.
7.0 /10
7.5 /10
7.2 /10
4.8 /10
0.8 /10
Product Details
Polysleep Sierra is a firm 9″ foam mattress with 2 interior layers. Featuring anti-microbial foam in its comfort layer, this mattress has good edge support and motion isolation, as well as average bounce. However, Polysleep Sierra notably lacks advanced cooling technologies. Memory foam is known for its heat-trapping properties, so you could notice overheating with this mattress.
Although most Polysleep mattresses have some branding on their cover, Polysleep Sierra’s cover is entirely white and has no branding whatsoever. The reason for this design decision is unclear, but it means that you can’t tell that the Sierra mattress is a Polysleep model just by looking at it. The cover is 100% polyester and is removable, but is not machine washable.
Polysleep Sierra comes with an industry standard 100-night sleep trial. However, it only has a 5-year warranty, which is only half the length (or less) compared to the warranties of most other mattresses. This is also the only full-scale Polysleep mattress with such a short warranty.
Competing mattress Juno, in comparison, offers more features for a lower price at $499 for a queen size. Juno comes with a layer of cooling gel foam, a 120-night sleep trial, a 15-year warranty, and an optional Cool+ cover upgrade for an even cooler sleep. Your purchase also comes with a free bedding bundle that includes a mattress protector, pillow(s), sheets, and pillow protector(s).
Ideal For: Back Sleepers, Stomach Sleepers
Polysleep Sierra Mattress Sizes & Prices
Get an affordable mattress in a wider range of sizes when you shop Juno.
Compare Juno vs Polysleep
Delivery, Sleep Trial & Returns
Polysleep ships for free across most of Canada via UPS and FedEx. Your mattress should reach your doorstep in 4–9 business days, including dispatch and delivery time. If you live in a remote area, like the Yukon, Northwest Territories, or Nunavut, you’ll have to pay an additional shipping fee.
Polysleep offers a 100-night sleep trial to test your mattress at home. This trial isn’t available in the Canadian Territories. You can return or exchange your mattress for a different one, but only after the first 45 nights have passed. This is almost half the length of the sleep trial, giving you only 55 remaining days to complete your return.
The company only offers partial refunds on return mattresses, charging a return fee of $89.95. If you choose to exchange your mattress for a different one, it’s unclear whether Polysleep offers a partial refund if you switch to a less expensive mattress. If you switch to a more expensive mattress, you will need to pay the difference in price.
Finally, Polysleep offers a 5-year warranty for the Polysleep Sierra mattress. This is only half as long as the industry standard—and half as long as the warranty period Polysleep offers for most of its other mattresses. Many competing brands also offer much longer warranty periods. Juno, for example, has a 15-year warranty. That’s three times as long as Polysleep Sierra’s warranty.
Get the mattress with a 120-night sleep trial and 15-year warranty.
Compare Juno vs Polysleep
Polysleep Sierra Mattress Construction
Polysleep Sierra is an all-foam mattress that stands 9″ high and has 2 interior layers. All foam used is CertiPUR-US® certified.
- Layer 1: The top layer of the mattress is 2″ of open-cell memory foam. According to Polysleep, this layer is anti-microbial, but the company doesn’t specify what gives the foam this property. It’s also important to note that memory foam is known for heat trapping. The layer’s open-cell design may not be enough to keep temperatures comfortable, so you may notice overheating at night.
- Layer 2: The support layer is 7″ of Polysleep’s proprietary foam. This dense layer gives the mattress most of its bulk, and prevents you from sinking too deeply into it when lying down. It likely contributes to the mattress’s firmer feel, too.
Polysleep Sierra’s cover is made of 100% polyester. While it has a zipper and is removable, it isn’t machine washable. Any spills or stains should be spot-cleaned only. The cover does not contain any enhancements besides being antimicrobial, and doesn’t have any of Polysleep’s usual colours or branding.
Sleep cool and comfortable with Juno’s breathable, moisture-wicking Cool+ cover.
Compare Juno vs Polysleep
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This allows us to accurately rate and compare the performance of the mattresses reviewed on this website. Engineer independence and operating standards help ensure their results remain unbiased, valid, and reliable. Each mattress was evaluated using the same strict mattress testing methodology to protect the overall integrity of the results. The full report has been given the official stamp of approval from an APEGA-certified engineer operating under a strict ethical code of conduct.
Mattress testing conducted outside of this professional standard poses a greater risk of validity errors or reviewer bias.
7.0 /10
Firmness
In third-party engineer testing (commissioned by us), Polysleep Sierra had a deflection of 1.8″, resulting in a 7.0/10 firmness score. This places the mattress in the firm category. This level of firmness can be comfortable if you’re a back or stomach sleeper, but you may notice pressure on your hip and shoulder if you sleep on your side.
(Looking for an affordable mattress that’s a little less firm? Juno scored 6.0/10 for firmness, which means a medium-firm feel that’s great for all sleep styles.)
7.5 /10
Edge Support
Polysleep Sierra had a deflection of 4.7″ from a seated position, giving it an edge support score of 7.5/10. This is a very good score for an all-foam mattress. You can sleep farther away from the middle or sit on the edge of this mattress without sinking too deeply into the sidewalls.
(A little more edge support goes a long way. Consider Juno with its higher score of 8.0/10.)
7.2 /10
Motion Isolation
Foam mattresses generally have high motion isolation. Polysleep Sierra earned a motion isolation score of 7.2/10, which is very good for a foam mattress. If you sleep with a partner or pets, you won’t notice when they change sleep positions on the other side of the bed.
4.8 /10
Bounce
Foam mattresses tend to have less bounce than hybrid or innerspring mattresses. Polysleep Sierra earned a bounce score of 4.8/10, which is about average for a foam mattress. You shouldn’t have any problem changing sleep positions or getting out of bed.
(Looking for a mattress with less bounce? Juno‘s lower bounce score of 2.5/10 gives you the smooth, uninterrupted sleep you deserve.)
0.8 /10
Cooling Features
Polysleep Sierra isn’t described as a cooling mattress on the manufacturer’s website, and only has a single cooling feature worth noting. This mattress earns points for its:
- Open-cell memory foam, which promotes better airflow throughout the mattress.
If you’re on a budget and you’re looking for an all-foam mattress that does more to help you sleep cool, you might want to check out Juno. Juno’s layer of cooling gel foam and optional Cool+ cover upgrade reduces heat buildup and gives you the comfortable night’s sleep you deserve—at just $499 for a queen size.
Compare Juno vs Polysleep
Company Background
Founded in 2016, Polysleep is a Canadian company that offers most of its retail services online. Previously, the company maintained a rating of “A+” on Better Business Bureau, but their profile on that website appears to have been removed.
Polysleep also has 3.5/5 stars on its unclaimed Trustpilot profile, but there aren’t any reviews to go with that rating. The lack of company information and customer reviews on third-party consumer trust websites is highly unusual, and makes it difficult to say whether you would enjoy sleeping on a Polysleep mattress.
While Polysleep has 2,500+ reviews on its website, there are only a handful of one- and two-star reviews. Again, this is extremely unusual. One such review says they tried to leave a one-star review, but “they don’t allow them on their website.” This means there may be more reviews that aren’t shown and could present a far different picture of the company and/or its mattresses.
Frequently Asked Questions
Are Polysleep mattresses good?
Polysleep mattresses have a few interesting features, and perform well in third-party engineer testing (commissioned by us). However, they’re often priced higher than average compared to the features they provide, and their 100-night sleep trial is only standard for the industry. The company only accepts returns after 45 nights of the trial have passed, and charges an additional $89.95 return fee.
We think there’s more value in Juno. At $499 for a queen size, Juno offers more advanced cooling features including cooling gel foam, an optional Cool+ cover upgrade, and a full range of mattress sizes, including RV. You’ll also get a free bedding bundle, a longer 120-night sleep trial, easy return pickup with a full refund, and a 15-year warranty. That’s much longer than Polysleep’s 10-year warranty (5 for Polysleep Sierra.)
Who owns Polysleep?
Polysleep is privately owned by Jeremiah Curvers, the company’s founder and current CEO.
Where are Polysleep mattresses manufactured?
Polysleep manufactures all of its mattresses in Canada.
Do Polysleep mattresses need a special bed frame?
Polysleep recommends using a slatted bed frame for all of its mattresses. The slats should be a minimum of 2″ wide, and have a gap no greater than 3″.
What does the Polysleep warranty cover?
Polysleep offers separate warranties for each of its mattresses. The Polysleep Sierra mattress comes with a 5-year manufacturer’s limited warranty. This warranty covers manufacturing defects, surface indentation, splits and cracks in the foam, and defects in the mattress cover’s zipper. It’s unclear if the warranty covers damage to the mattress during delivery.
(In comparison, competing mattress Juno comes with a 15-year warranty—three times as long as Polysleep Sierra’s.)
How long does a Polysleep mattress last?
Typically, a mattress should last as long as its warranty period. Polysleep’s standard warranty is 10 years, but Polysleep Sierra only has a 5-year warranty. You could find the mattress has a similar lifespan. (In comparison, Juno comes with a 15-year warranty—much longer than any Polysleep mattress.)
READ MORE: How long should a mattress last?
What Polysleep mattress alternatives should I consider?
If you’re on a budget and you’re looking for a mattress with a few more features, we think you should check out Juno. At $499 for a queen size, Juno comes with cooling gel foam, an optional Cool+ cover upgrade, a 120-night sleep trial, and a 15-year warranty. You’ll also get a free bedding bundle with your purchase, which includes a mattress protector, pillow(s), sheets, and pillow protector(s).
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Winner!
2024 Best Value Foam
A mattress made in Canada
A foam mattress for under $500
