NM HD 6" Extra-Firm High Density Foam Mattress - King
Meet NM® HD+™ Core—mattresses built around high‑density foam for durable support, low motion transfer for quieter nights, zoned lumbar for alignment, and reinforced edges for full‑width comfort. Available in firm, medium, and plush feels across Twin, Twin XL, Full/Double, Queen, and King.
NM HD 6" Extra-Firm High-Density Foam Mattress - Discover Unmatched Comfort and Support
Searching for a mattress that balances durability with comfort? Introducing the NM HD 6" Extra-Firm High-Density Foam Mattress, meticulously crafted for those who value a robust and supportive sleep experience. Engineered with high-density foam, this mattress provides a resilient surface that combats sagging, ensuring you enjoy a well-aligned spine and restful nights. Its innovative design features a comfort layer that gently contours to your body, making it perfect for back and stomach sleepers as well as growing children in need of solid support.
Key Features
High Density Foam Core: Feel the difference with a mattress that offers lasting durability and reliable edge-to-edge support, built with the same sturdy foam trusted in commercial settings.
Cotton Quilted Cover: Enjoy the breathable comfort of a cotton quilted cover that enhances airflow, ideal for those in warmer regions or for cozy RV setups.
Compact 6" Height: This low-profile mattress conveniently fits snugly in bunk beds and trundles, providing an elegant solution for space-limited situations.
Benefits
Firmness Rating (9/10): Promote optimal spine alignment while minimizing motion transfer, ensuring a peaceful night’s sleep without disturbances.
Crafted in Canada: Invest in quality and local craftsmanship with a product made under strict Canadian manufacturing standards, providing you with a product you can trust.
5-Year Warranty: Rest assured with a 5-year limited warranty, demonstrating our commitment to quality craftsmanship and long-lasting durability.
Ideal For
Individuals who prefer firm support for back and stomach sleeping positions.
Parents looking for a mattress that will provide their growing children with the support they need.
Those in search of a compact mattress that can fit adjustable frames and Murphy beds.
Details
Dimensions: 76″ x 80″ (inches) – 193cm x 203cm (centimeters)
Profile Height: 6 Inches
Firmness: Extra Firm
Warranty: 5-Year Limited Warranty
Guarantees: Free next day delivery, 100 night sleep trial, price match guarantee
Transform your sleep experience with the NM HD 6" Extra-Firm Mattress, designed for those craving lasting support without sacrificing comfort. This mattress combines superior craftsmanship with attractive guarantees, making your purchase as reassuring as your sleep. Elevate your nights and discover how rejuvenating rest feels—check our website for exclusive offers and get ready to experience incredible comfort delivered straight to your door!
We offer FREE DELIVERY to all major cities in Ontario and the surrounding area on orders over $199. A delivery surcharge of $45 applies to orders under $199.
Select your delivery date at checkout (if applicable) and add any special instructions in the order comments (e.g., “Ring Buzzer #1234”). If a date isn’t shown or selected at checkout, you’ll receive an email with scheduling options. Day‑of, you’ll get a text and email with a 2‑hour window and live tracking. Estimates apply to in‑stock items; rural or weather‑affected addresses may require extra time.
Barrie • Innisfil • Orillia • Midland • Collingwood • Bradford • Washago and more
1–3 days on average
Northern & Eastern Ontario
Cobourg • Peterborough • Kawartha Lakes • Minden • Haliburton • Port Perry • Bowmanville and more
1–3 days on average
Western Ontario
London • Stratford • Woodstock • Brantford • Grand Bend • Port Elgin • Tobermory and more
Need delivery outside the GTA?
We also ship to all provinces in Canada at competitive rates (territories excluded). Enter your postal code at the top of the website to see what’s available.
Ready to Sleep Better?
Shop online 24/7 or visit any National Mattress location across Ontario. Spend $199+ and relax—your new mattress will arrive quickly and free of charge locally, or ship fast across Canada.
Where does National Mattress offer free local delivery?
We offer FREE local delivery to major cities across Ontario on orders of $199+. Check the region cards above for specific cities.
Do you ship mattresses across Canada?
Yes. We ship select roll‑packed mattresses to all provinces (YT, NT, NU excluded). Transit times range from 1–2 days in ON & QC to 3–4 days in BC and NL after shipping.
Is next‑day delivery available in the GTA?
Yes. FREE next‑day local delivery is available in many GTA and surrounding areas, subject to inventory and cutoff times.
What if my Ontario local order total is under $199?
A $45 delivery surcharge applies to orders under $199.
How do I schedule or change my delivery date?
Select a date at checkout. If a chosen date isn’t available, you’ll receive an email proposing an alternative—simply reply to reschedule. In‑store purchases can be scheduled at the time of sale.
Will I get tracking updates?
Yes. Local deliveries include day‑of text/e‑mail with a 2‑hour window plus live GPS tracking. Canada‑wide shipments include a courier tracking number once picked up.
Do you deliver to Yukon, Nunavut, or the Northwest Territories?
What materials give this mattress its extra-firm feel?
This mattress uses a combination of extra-firm comfort foams and a robust support core such as high-density base foam or firm, high-gauge pocketed coils to create its extra-firm feel.
The design limits sink-in and keeps the surface very flat; see the...
What type of mattress protector should I use that wont feel hot or noisy?
Look for waterproof protectors made with soft, breathable fabrics and a quiet backing layer.
Modern protectors are often designed to feel like a regular sheet while still blocking liquids and minimizing crinkling sounds when you move at night.
What are the exact dimensions of this 6 inch mattress?
Is this mattress suitable if I have lower back issues?
This extra-firm mattress is designed to provide very high support and minimize hip and torso sink, which can help some people with lower back problems.
If you have diagnosed back issues or are unsure whether extra-firm is appropriate for you, talk to...
Does this mattress have zoned support that benefits back sleepers?
This mattress includes zoned support that is slightly firmer under the hips and lower back and a bit more forgiving under the shoulders. This can be particularly helpful for back sleepers, as it encourages better spinal alignment while still allowing...
Is there a weight limit for this king mattress?
Most king mattresses list a recommended weight range or are designed to support typical single sleepers or couples.
Check the product specifications or warranty details for any stated weight limits to ensure the mattress is a good match for the intended...
Can I use this king mattress on a slatted bed frame?
Yes, most king mattresses can be used on slatted frames as long as the slats are sturdy and properly spaced.
Many manufacturers recommend slats that are no more than about 3 apart to support the mattress and prevent sagging between slats.
Does this mattress have strong edge support?
This extra-firm mattress includes edge-support features such as reinforced coils or denser foam rails to help reduce roll-off and make it comfortable to sit or sleep near the edge.
Check the product description for more details on how the edges are ...
Is this king mattress good for side sleepers?
Side sleepers usually prefer a mattress that relieves pressure at the shoulders and hips while keeping the spine aligned.
Look for king mattresses described as medium or medium-soft with comfort layers that contour to the body and cushion key pressure...
Is this firm mattress okay for everyday use or better for occasional sleep?
This firm mattress is designed for regular nightly use, with comfort and support features suited to sleepers who enjoy a firmer feel.
If you plan to use it every night, review the materials, firmness description, and customer reviews to confirm that...
Is this foam mattress better suited for a primary bedroom or a guest room?
This mattress offers a specific combination of comfort, support, and durability that may make it ideal for nightly use in a primary bedroom. Review the firmness, build quality, and price point to decide where it best fits in your home.
Does this foam mattress have cooling features?
This foam mattress incorporates materials and design elements such as breathable cover fabrics, open-cell or gel-infused foams, or ventilated layers intended to help manage heat.
Check the product description for specific cooling features included in...
Is this mattress a true tight top or does it have extra cushioning on top?
This mattress is constructed as a true tight top, with comfort layers integrated directly under a flat, uniform cover and no separate pillow or Euro-top pad.
You can see the smooth, traditional surface in the product images and description, which distinguishes...
Do I need special sheets or a protector for this tight top mattress?
Tight top mattresses usually work well with standard fitted sheets and a breathable mattress protector.
If the mattress is thicker than average, you may prefer deep-pocket sheets to ensure a secure fit without compressing the comfort layers excessively...
Can this king mattress be used on a storage bed or platform bed?
Most king mattresses are compatible with platform and storage beds as long as the base provides adequate, even support.
Check the product details for any specific base recommendations and ensure your frame's slats or platform are sturdy and properly...
Is this 6 inch mattress suitable for a daybed?
Yes, this 6 inch mattress can work well on many daybeds, where a lower profile looks more like a sofa during the day and is comfortable enough for lounging or occasional sleeping. Check your daybed's recommended maximum mattress height and dimensions...
Is this mattress okay for everyday use or better for occasional sleep?
This extra-firm mattress is designed for regular nightly use for sleepers who enjoy a very firm feel.
If you plan to use it daily, review the materials, firmness description, and customer reviews to confirm that its extra-firm profile matches your comfort...
Does this king mattress sleep hot?
Temperature regulation depends on the materials and cover.
Mattresses with breathable fabrics, open-cell foams, cooling gel, phase-change materials, or coil support cores tend to allow more airflow and feel cooler than dense, non-ventilated foams.
...
How long does it take for a king mattress to fully expand after unboxing?
Most boxed king mattresses expand to near full size within a few hours, but they may continue to relax and reach their final feel over 24-72 hours.
Room temperature, ventilation, and the specific materials can affect expansion time; follow the manufacturer...
Do I need a mattress protector for this foam mattress?
A mattress protector is strongly recommended for any foam mattress.
It helps keep the surface clean, protects against spills and allergens, and can extend the life of the mattress by preventing moisture and debris from breaking down the foam layers ...
Is this 6 inch mattress supportive enough for a heavier sleeper?
This 6 inch mattress is designed primarily for lighter sleepers, children, or occasional use. Heavier sleepers may prefer a thicker mattress with more robust support and cushioning. Check the weight guidelines and product description to determine if ...
Will this 6 inch mattress feel too low in a platform bed in a small room?
A 6 inch mattress will sit lower than standard mattresses, which can be an advantage in rooms with low ceilings or small spaces. If you prefer a higher sleep surface, you can pair it with a taller bed frame or box foundation to raise the overall height...
Is this 6 inch mattress all foam or does it have springs?
This mattress uses the construction described on the product page, such as all foam or a hybrid of coils and foam. Check the materials section for details about the support core, comfort layers, and cover so you know exactly what is inside.
Is this 6 inch mattress compatible with an adjustable base?
Some 6 inch foam and hybrid mattresses are flexible enough for adjustable bases. Check the product description for notes on adjustable base compatibility and follow the manufacturer's guidelines to make sure using an adjustable base will not affect...
Will this 6 inch mattress feel different from my current thicker mattress?
Yes, a 6 inch mattress will usually feel firmer and simpler than a thicker mattress with multiple comfort layers. You may notice less sink and contouring. Check the firmness rating and user reviews on the product page to get a sense of how the feel compares...
Is this 6 inch mattress a good value for the price?
This 6 inch mattress is designed to balance cost, comfort, and support. Review the materials, warranty, and customer reviews on the product page to see how it performs in real use and whether it offers the value you expect for your budget and intended...
– 1000 Hi-Loft Pocket Coil with Foam Encased Perimiter – HD High Density Support Foam – Bio-Foam natural foam content reduces your carbon footprint – 10 Year Warranty – Made In Toronto, Canada
In Stock, Ready for Pickup
Not Displayed
Login and Registration Form