OPEN BAG - NM HD 6" Extra-Firm High Density Foam Mattress - Single/Twin
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.
Unrivaled Comfort Awaits with the NM HD 6" Extra-Firm High-Density Foam Mattress
If you’re searching for a firm yet comfortable sleep surface that offers exceptional support without breaking the bank, look no further. The NM HD 6" Extra-Firm High-Density Foam Mattress is expertly crafted to ensure proper spinal alignment while providing a cool and breathable experience. Ideal for back and stomach sleepers alike, this mattress is designed with a durable foam core that stands the test of time, so you can enjoy revitalizing sleep every night.
Key Features
Robust High Density Foam Core: This unique core structure delivers consistent support across the entire surface, minimizing sagging for long-term comfort.
Pressure-Relieving Comfort Layer: The 2-inch HD+ Foam gently cradles your body to ease pressure points on your shoulders, hips, and lower back, enhancing your overall comfort.
Natural Cotton Quilted Cover: The breathable cotton allows for optimal airflow and moisture management, keeping you cool and comfortable throughout the night.
Exceptional Firmness: With a firmness rating of 9/10, this mattress effectively promotes healthy spinal alignment while reducing motion transfer for uninterrupted sleep.
Crafted with Care in Canada: This mattress is built in Canada, guaranteeing adherence to best practices in safety and sustainability standards.
Sturdy Edge Guard: With enhanced edge support, this feature ensures that you can comfortably sit or sleep right on the edge, increasing usability.
Benefits
Durability at Its Best: Designed with high-density foam that ensures your mattress remains supportive and intact for years, providing excellent value for your investment.
Perfectly Compact: At just 6 inches, this mattress suits small spaces like bunk beds and RVs, making it an excellent choice for limited areas.
Confidence in Craftsmanship: Enjoy peace of mind with a 5-year limited warranty that backs the quality and longevity of your purchase.
Ideal For
Individuals who require a firm sleeping surface, especially back or stomach sleepers.
Children or teens needing reliable support for their growing bodies in bunk beds.
Anyone searching for versatile sleeping solutions for college dorms, guest rooms, or compact living spaces.
Details
Dimensions: 39″ x 75″ (inches) – 99cm x 190.5cm (centimeters)
Profile Height: 6 Inches
Firmness: Extra Firm
Core Structure: Double Tempered Bonnel Coil with High Density Foam Inserts
Support Layers: Center & Lumbar Support
Cover Material: Cotton Blend
Certifications: CertiPUR-US certified foams for safety and performance.
Guarantees: Enjoy free next day delivery, a 100 night sleep trial, full manufacturer's warranty, and a price match guarantee.
Transform your sleep experience with the NM HD 6" Extra-Firm Mattress, showcasing the perfect blend of trusted craftsmanship and luxurious comfort. This thoughtfully designed mattress invites you to enjoy restorative nights and energetic mornings, making it an ideal addition to any bedroom setting. Don’t wait to enhance your sleep quality—experience the comfort that you truly deserve!
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?
How long should I wait before sleeping on this mattress after unboxing?
This mattress can usually be slept on the same day you unbox it, but it may take up to 24-72 hours to reach its full height and intended feel.
Consult the product instructions for specific recommendations on minimum expansion time before regular use...
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...
Will this mattress hold its shape over time?
This extra-firm mattress is engineered with durable support and comfort materials to help maintain its shape and feel for many years under normal use.
Following the care and support guidelines on the product page will help you maximize its performance...
What are the exact dimensions of this 6 inch mattress?
What type of mattress is this (foam, latex, hybrid) and how does that affect its performance on an adjustable bed?
This mattress uses a specific core type such as foam, latex, or a pocket coil hybrid paired with flexible comfort layers, which helps it bend smoothly on an adjustable base.
See the construction section for details on the core and comfort materials ...
What warranty and trial period come with this mattress?
Yes, we offer a 100 night sleep trial with any mattress purchase.
What types of foam are used in this mattress?
This foam mattress uses a combination of support and comfort foams such as high-density base foam, transitional foam, and softer top foams for pressure relief.
See the construction and materials section on the product page for detailed information on...
How long does it take for a twin mattress to fully expand after unboxing?
Most boxed twin 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 materials can affect expansion time; check the manufacturer's guidance...
What materials and construction does this mattress use?
This mattress in a box uses a specific combination of support and comfort materials such as high-density foams, pocketed coils, or latex to deliver its feel and performance.
See the construction and materials section for a detailed breakdown of each...
How does this extra-firm model compare in feel to your firm and medium-firm models?
This extra-firm mattress is noticeably harder and flatter at the surface than our firm and medium-firm options.
If you want maximum support with minimal cushioning, choose this extra-firm model; if you prefer some contouring and softer pressure relief...
Does this mattress provide extra support for the lumbar area?
This mattress includes features aimed at supporting the lumbar region, such as a firmer middle zone or supportive transition layers. These elements help the lower back maintain its natural curve while you lie on your back.
Is there a weight limit for this twin mattress?
Most twin mattresses list a recommended weight range or are designed to support typical child, teen, or single adult weights.
Check the product specifications or warranty details for any stated weight limits to ensure the mattress is suitable for the...
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...
Do I need a mattress protector for a twin mattress?
A mattress protector is highly recommended.
It helps keep the twin mattress clean by guarding against spills, sweat, dust, and allergens, and it can significantly extend the life of the mattress, especially in kids' rooms or guest spaces.
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...
Will this twin mattress fit my existing bed frame?
Most standard twin bed frames are built to fit a mattress around 38 x 75.
Check your frame's inner dimensions and compare them with the mattress specifications on the product page to ensure a proper fit with no gaps or overhang.
Is this twin mattress comfortable for everyday use?
This twin mattress is designed for regular, nightly use with a balance of comfort and support suitable for its intended sleeper group (such as kids, teens, guests, or adults).
Check the firmness, materials, and customer reviews on the product page to...
Does this twin mattress come rolled or boxed?
Many modern twin mattresses are shipped compressed and rolled in a box for easier delivery and setup.
Check the product details for information on packaging and follow the unboxing instructions to allow the mattress to expand to its full size.
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...
In Stock, Ready for Pickup
Not Displayed
Login and Registration Form