Polysleep Sierra Review

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In This Review
Performance Tests | Firmness | Support & Sleeping Positions | Design | Materials | Comparisons | FAQs

At NapLab, we put each mattress to the test.

We test 10 different factors that impact the performance, comfort, and value of the mattress. We then take the results of that test and compare to every mattress we’ve tested to date.

Check out the full performance table below to see how this mattress ranks:

Factor	Polysleep Sierra	Average
Overall Score	7.69	8.62
Price (Queen)	C$483	$1,089 (Foam only)
Cooling – Score	7.0	8.7
Sinkage – Depth	1.81″	2.15″
Sinkage – Feel	Minimal	Moderate
Motion Transfer – Score	6.9	8.1
Motion Transfer – Acceleration	11.80 m/s²	8.76 m/s²
Response Time – Score	10	8.9
Response Time – Mostly Recovered	0.2 sec.	0.4 sec.
Response Time – Fully Recovered	0.3 sec.	0.9 sec.
Bounce – Height	10.38″	9.71″
Bounce – Feel	High	Moderate
Edge Support – Score	8.4	8.6
Edge Support – Sitting	3.25″	4.05″
Edge Support – Lying	Fair	Good
Sex – Score	9.0	8.5
Pressure Relief – Score	7.0	8.8
Comfort Layer Thickness	2.0″	4.1″
Mattress Thickness	9″	12.0″
Off-Gassing – Score	8.1	8.4
Off-Gassing – Smell	Strong	Strong
Off-Gassing – Days	7 days	6 days
Company – Score	7.1	8.7
Trial	100 nights	168 nights
Warranty	5 years	24% have lifetime warranties, average of other 76% of mattresses is 13 years

How is PolySleep Sierra Different?

The Polysleep Sierra is a 9″ foam mattress with below-average performance but also a price that is significantly below average as well—67% less expensive than the average foam mattress.

Advantages

Besides the below price, other advantages of the Sierra include fast material response time and better sex performance.

Neutral Factors

This mattress also has minimal sinkage and high bounce. Both bounce and sinkage are more preferential factors but may be an advantage or disadvantage for some sleepers.

Disadvantages

This mattress has more disadvantages that outnumber the advantages for many. Disadvantages include worse cooling performance, higher levels of motion transfer (35% more than average), and slightly worse edge support (20% worse than average). It also has a thinner comfort layer and worse pressure relief.

Company disadvantages include a shorter trial period and shorter warranty as well.

The Polysleep Sierra has a fair level of cooling performance. During our tests, I felt a moderate level of heat retention around my body.

The mattress is an all-foam design, uses relatively basic poly foams, and has no substantial cooling features. As a result, there is only so much you should expect out of cooling performance. To be fair, it’s also incredibly budget-friendly.

Mattresses at this price point, especially all foam mattresses, generally don’t get much better than this for cooling.

• Baseline Temperature – the temperature of the mattress before anyone lies on it
• Maximum Temperature (0 minute) – the temperature of the mattress after lying on it for 15 minutes
• Ending Temperature (5 minute) – the temperature of the mattress after being lied upon and having no one on it for 5 minutes

In our objective temperature testing, we measured a max surface level temperature of 91.6°F. This is 2.0° warmer than the average. After getting off the mattress from minutes 0 to 1 the temperature declined 4.4°, which is 0.3° warmer than average. The 0 to 5-minute decline was 6.0°, which is 1.3° warmer than average.

Heat Dissipation Over Time

When we consider the objective data, subjective experience, and materials used, this is a mattress capable of delivering only a fair level of cooling performance.

The Polysleep Sierra has a minimal level of sinkage. In our sinkage tests, we measured a pressure point sinkage depth of 1.81”. This is 0.34” less sinkage than the average of 2.15”.

The mattress creates more of a “floating” feeling as opposed to sinking down “in” the mattress.

The level of sinkage is documented in the image below.

With only 2.0” of comfort material there is only so far down the mattress is able to sink and contour the body before you hit the support foam, which more firmly resists and floats the body.

At just 9.0” thick this is pretty typical performance for an all foam mattress.

The Polysleep Sierra has a high level of motion transfer. In our tests, we measured an acceleration range of 11.80 m/s². This is 36% more motion than the average of 8.68 m/s².

Typically, all foam mattresses do a better job at reducing motion. However, thinner mattresses and mattresses with a thinner comfort layer create more motion transfer. So while the all-foam design is helping, the relative thinness of the total profile and comfort layer are negatively impacting motion.

The level of motion transfer is also documented in the video below.

In our motion transfer chart, which visualizes our accelerometer data, we can see the highest motion peaks from 0 to 0.15 seconds.

There is a small secondary spike from 0.45 to 0.52 seconds and by 0.89 seconds we’ve returned to near zero levels of energy. While the initial motion spike is quite high, the level of motion following the spike is well restrained.

This is a mattress where more sensitive sleepers will likely find the motion is just too much. However, many other sleepers will find it acceptable.

The Polysleep Sierra has an extremely fast material response time. In our tests, we measured a mostly recovered response time of 0.2 seconds. This is 51% faster than the average of 0.41 seconds.

The level of responsiveness is documented in the video below.

In our fully recovered test, we measured a recovery speed of 0.3 seconds, which is 66% faster than the average of 0.89 seconds.

This is effectively an instant material responsiveness and is tied first with a number of other mattresses. The rapid responsiveness ensures you’ll never feel stuck on the mattress.

The Polysleep Sierra has a high level of bounce. In our tests, we measured a total bounce height of 10.38”. This is 0.68” more bounce than the average of 9.70”.

The level of bounce is also documented in the video below.

Typically, all foam mattresses don’t have much bounce. However, the thin total profile, thin comfort layer, and minimal level of sinkage are all working together to create more rebound and bounce on the mattress.

While the Sierra isn’t as high as many hybrid and coil-based mattresses, it’s no slouch when it comes to bounce. Higher bounce improves sex bounce and makes it easier to move around on the mattress.

The Polysleep Sierra has excellent sitting edge support and fair lying edge support. In our sitting edge support test, we measured a sitting sinkage compression of 3.25”. This is 0.80” sinkage less than the average of 4.05”.

While sitting on the edge of the mattress the Sierra did a nice job of remaining supportive and retaining its shape. That said, lying edge support left something to be desired.

The level of edge support while seated is documented in the images below.

While lying directly on the edge of the mattress I did not feel well supported. I needed to move a couple of inches away from the absolute edge to again feel well-supported.

The level of edge support while lying is documented in the images below.

Given the price point, 9.0” design, all foam construction, and absence of any type of reinforced edge support foam, this performance is perfectly reasonable and expected. 

The Polysleep Sierra has excellent sex performance. The Sierra nails the two primary factors you need for great sex, high bounce and great sitting edge support.

In addition, the mattress is quiet. The only minor detractors for sex are pressure relief and cooling, both of which have a fair level of performance, but also leave much to be desired.

As with many other performance aspects of the Sierra it’s hard to complain too much given the price point. Yes, it’s not perfect, but it’s more than serviceable and what you’d expect at this price.

Sex Factor	Factor Weight	Score	Rating
Bounce	65%	9.0	Very High
Edge Support	20%	9.7	Excellent
Noise	5%	10	Minimal
Pressure Relief	5%	7.0	Fair
Cooling	5%	7.0	Fair

The Polysleep Sierra has a fair level of pressure relief performance. During our tests, I felt a moderate level of building pressure on my body, especially my lower back. Ultimately, this is a very inexpensive, budget-friendly mattress.

At just C$483 for a Queen, they just don’t have much money to equip the Sierra with sufficiently thick foam to deliver better levels of pressure relief.

The mattress uses a 2.0” comfort layer, which is 2.1” thinner than the average comfort layer thickness, which is 4.1” (based on all of our tests to date).

This thin comfort layer means your body comes into greater contact with the support foam, which in turn creates the pressure points. For lighter-weight bodies, kids, and guest rooms, this level of pressure relief is likely to be sufficient.

However, for most adults seeking a primary mattress, I would strongly recommend the step up to the Polysleep Origin or PolySleep Aura, both of which have notably better pressure relief performance.

Pressure Map – Side Sleepers

Pressure Relief (PSI)	Average	Minimum	Maximum
Side Sleepers	0.29	0.02	1.30

Pressure Map – Back Sleepers

Pressure Relief (PSI)	Average	Minimum	Maximum
Back Sleepers	0.18	0.02	1.33

Pressure Map – Stomach Sleepers

Pressure Relief (PSI)	Average	Minimum	Maximum
Stomach Sleepers	0.15	0.02	1.08

Off-gassing on the Polysleep Sierra is strong right out of the box and takes 7 days for the smell to dissipate.

Polysleep mattresses are made in Canada with mattresses being sold in US and Canadian markets (mattress models available by country). All mattresses come with a 100-night trial period, a 5-year warranty, and free shipping.

At any point in your trial, if you decide this mattress isn’t the right pick for you, you can exchange or return it for a full refund (minus a $90 return fee).

Company Factor	Factor Weight	Score	Data
Trial Period	15%	8.0	100 nights
Warranty	10%	0.0	5 years
Shipping	5%	10	$0
Returns	20%	7.0	$90
Trust	50%	8.0	Good
Country of Origin	0%		Canada

Compared to average company policies, the Polysleep has a shorter trial period and shorter warranty than average. For reference, the average trial period is 166 nights and the average warranty is 14 years (26% of all mattresses have lifetime warranties).

Polysleep’s 5 year warranty is perhaps the most disappointing. Out of the 226 mattresses we’ve tested to date only 3 have had a warranty of less than 10 years. And 2 of those 3 are Polysleep mattresses. The industry norm is 10 years or more. I really would like to see Polysleep step up to the 10 year warranty mark for all of their mattresses.

The Polysleep Sierra is a 9″ all-foam mattress with a medium-firm feel. It is a 6 out of 10 on the firmness scale, where 10 is the most firm. This firmness is generally suitable for a wide range of sleepers in all positions and varying weights.

The Polysleep Sierra has a fair level of support. During our tests, I felt well-supported. However, I also felt moderate pressure points on my body. The Sierra’s support problem is really more of a pressure relief problem.

With only 2.0” of comfort materials, many sleepers, especially side sleepers, are more likely to sink through the comfort layer and come into greater contact with the support foam layer.

The support foam layer just isn’t especially comfortable and only having 2.0” of comfort material means sleepers will really feel that layer. This will create spinal alignment sleepers for many.

Check out the table below to see the sleeper weights and sleeping positions that would be best suited for this mattress.

Sleeper Weight	Stomach Sleepers	Side Sleepers	Back Sleepers
Under 150 lbs.	Yes	Yes	Yes
150-250 lbs.	Maybe	Maybe	Maybe
250-300 lbs.	No	No	No

Design

The Polysleep Sierra is a 9″ foam mattress with a medium-firm feel. It is designed as a base-level mattress, providing a budget-friendly option for Canadian sleepers looking for an all-foam mattress.

While you certainly do sacrifice some areas of performance, the price point is especially compelling.

Materials

This mattress has a very simple 2-layer design. Layers include:

• 2.0” poly foam
• 7.0” support foam

The Cover

The Polysleep Sierra has a 100% polyester cover that is thin, soft, stretchy, and removable. There is a zipper closure that allows the cover to easily be washed or spot-cleaned.

The Comfort Layer

The comfort layer of the Sierra is a relatively thin 2.0″ poly foam. There’s nothing inherently special about this comfort layer. It is simple and provides a balanced feel.

This comfort layer has a foam density of 3.0 lbs / ft³ (PCF).

As mentioned above, heavier sleepers will likely find this support to be inadequate, as 4″ or more of comfort material is usually preferred.

The Support Layer

The Sierra support layer is a 7.0″ high-density support foam. This layer supports the comfort layer above. This layer has a foam density of 1.5 lbs / ft³.

For an all-foam mattress, this is about what we’d expect to see.

Product Evolution

The Polysleep Sierra mattress was released in 2023 as the “most affordable antimicrobial foam mattress made in Canada”. Since its release, there have been no major design changes made to this mattress.

Other Mattresses to Consider

Not sure if the Polysleep Sierra is the right pick for you? Check out these three other top-rated foam mattresses for high-performing alternatives you may want to consider.

Frequently Asked Questions

Still have questions? Check out some of the top FAQs on the Polysleep Sierra mattress below and get the answers you’re looking for.