It seems like you're not in the right place!
Let us guide you on your path to a better night's sleep.
The Sierra Mattress
We invested in manufacturing automation to create the most affordable Canadian-made đ 9-inch antimicrobial foam mattress entirely made in Canada by reducing non-crucial steps. You can enjoy peaceful nights knowing that this value mattress - that has the same quality as every others Polysleep's products - is looking after your health and... your wallet!
Semi-Firm Firmness
9'' Thickness
Best value for the price
Choose your Mattress Size
Size:
TWIN
Size Chart
Order now to get it by October 9, 2026. FREE shipping.
Materials & Dimensions
Twin â 39" x 75" x 9" - 41.4 lbs
Full â 54" x 75" x 9" - 56.6 lbs
Queen â 60" x 80" x 9" - 61.6 lbs
King â 76" x 80" x 9" - 78.8 lbs
Product Specifications
The 9" Sierra memory foam mattress is made of 2 layers.
Removable cover:
100% Polyester.
Comfort layer (2 inches):
Polysleep open cell viscoelastic hybrid foam ISO 20743 certified - Density of 3.0 lb/ft3.
Support layer (7 inches):
Polysleep foam - Density of 1.5 lb/ft3.
Our foams are latex free.
CertiPUR-US: manufactured without ozone depleting chemicals and regulated by the Consumer Product Safety Commission for indoor air quality (less than 0.5 ppm) and for volatile organic compound emissions (Low VOC).
ISO 20743: ISO certified medical standard; no more dust mites or bacteria buildup.
Shipping
Enjoy fast & free shipping across all 10 Canadian provinces â no minimum required!
Delivery takes approximately 3 business days in Quebec and Ontario, and 5+ days elsewhere*
Please note that some exceptions may occur in remote or hard-to-access areas. For Yukon, Northwest Territories, and Nunavut, additional fees apply â our team will reach out before shipping to confirm costs and timelines.
Sometimes we're even quicker than expected, so keep an eye on your inbox for your tracking number and delivery updates!
*When there are no carrier strikes or disruptions.
Trials & Warranty
Trials
We know you'll love your Sierra mattress â that's why we offer a 100-night risk-free trial!
If it's not a match, you can request a return after 45 nights of sleep, you can easily initiate a return through our website.
Please visit our page to see all the details
Just make sure your mattress is clean and undamaged â for hygiene reasons, we can't accept soiled returns.
And don't worry about keeping the box, once your mattress is out of its sealed packaging, it's impossible to fit it back in (unless you happen to have a 3-ton hydraulic compressor at home đ).
Warranty
Your Polysleep Sierra mattress is backed by a 5-year limited warranty, ensuring long-term comfort and peace of mind.
This warranty covers manufacturing defects, foam durability, and issues with the fabric or zipper when the mattress is kept clean and properly supported.
Normal wear, stains, or damage from misuse aren't covered â but rest easy knowing your Sierra mattress is made in Canada with the same premium foam and craftsmanship trusted by sleepers nationwide.
Durable. Supportive. Guaranteed 5 years.
Sleep Must Haves
SAVE 25%
Firm TopperMemory Foam Mattress Topper
$250.00
SAVE 25%
The Sierra PillowFluffy and hypoallergenic
$69.99
SAVE 25%
The Mattress ProtectorWaterproof Mattress Protector
$230.00
The Sierra Mattress
Canada's Top Value Foam Mattress
1
2
3
1
Antimicrobial Foam
The antimicrobial top layer inhibits the growth of bacteria and provides a healthier sleep.
2
Supportive Foam Base
The base layer, made of millions of foam cells, provides unparalleled support improving overall comfort.
3
Removable Cover
Durable cover that can be removed with a zipper. Textile is very soft.
Firmness Scale
Our mattresses are rated on a firmness scale from 1 to 10, with 1 being the softest and 10 being the firmest. Experts from various medical backgrounds recommend a semi-firm mattress between 5 and 8 on the firmness scale.
Recommended by Experts
POLYSLEEP
SOFT
FIRM
Revolutionizing Sleep One Night at a Time
Each Polysleep memory foam mattress has unique features, designed by taking your feedback and implementing it into our products!
Hasta la Vista, Germs!
Did you know that the weight of your mattress can double in just a few years due to the build up of germs, sweat and dead skin cells? Yuck!
With an antimicrobial memory foam mattress, youâll benefit from a healthier sleeping surface and longer mattress life expectancy. Stay protected and sleep soundly knowing that our mattresses are equipped with antimicrobial foam.
We are proud to use our exclusive ISO 20743 antimicrobial foam, which significantly reduces the growth of bacteria that forms in your mattress over time.
Medical grade foam - ISO 20743 compliant
Less "Toss & Turn" Side Effects
Our hybrid foam has been designed to minimize the vibrations within your mattress so you feel your partnerâs and petsâ movements less.
An even deeper sleep without disturbance
Better than a Smart Thermostat
Whether you are a hot or cold sleeper, no more disturbed sleep due to drastic variations in body temperature.
Our open-cell memory foam allows air to flow and temperature to regulate, providing better, cooler sleep.
Sleep cool with our temperature control
Washable Water Resistant Cover
Experience the convenience and ease of maintaining a clean and fresh sleep surface with our Removable and Water Resistant Cover.
Our innovative cover has been designed to be easily washable making it low maintenance. In addition, it protects your mattress from spills, stains and accidents to ensure the longevity of your mattress.
Perfect for breakfast in bed
The Sierra Mattress
Compare our mattresses
Our products are carefully and delicately crafted in a local factory using state-of-the-art manufacturing methods. We take pride in working with superior, durable materials and always offer the best possible source of comfort on the market.
| The Sierra Mattress | The Origin Mattress | The Luna Mattress | Other mattresses | |
|---|---|---|---|---|
|
Queen Price |
$596.25 |
$746.25 |
$1,031.25 |
Expensive |
|
Mattress Height |
9" |
10" |
12" |
Meh |
|
Made in Canada |
Sometimes |
|||
|
Antimicrobial Certified ISO 20743 Foam |
||||
|
Best-in-Class Motion Transfer |
Customer Reviews
-
â ïž Handle with care when opening!
Your Polysleep mattress is tightly compressed using high-pressure hydraulic machinery.
Use the marked areas to open the box. Then use scissors to remove the plastic wrapping, but avoid knives or box cutters, as a sharp blade could easily slice through the foam.
Take your time â your mattress will unfold and be ready in seconds!
đïž Sleep on it right away
Once you remove the plastic, your mattress will expand almost instantly.
You can sleep on it immediately â thereâs absolutely no risk of damage.
What foundation should I use with my mattress?
đ€ Natural stabilization
The core of the mattress will take a few days to regain its full shape, stabilize and will reach its optimal firmness within about one week.
Your body may need up to 45 days to fully adjust to your new level of comfort and support.
Enjoy it from the very first night â comfort only gets better with time!
