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OPEN BAG - NM HD 6" Extra-Firm High Density Foam Mattress - Twin XL

Q: What are the exact dimensions of this 6 inch mattress?

This mattress is approximately 6 inches high and is available in standard width and length sizes such as Twin, Twin XL, Full, Queen, or RV specific dimensions. Check the size chart on the product page for exact width, length, and height measurements.

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.

Top Features

Add To Compare

– High Density Foam Core

– High Density Foam Comfort Layer

– Cotton Support Quilt

– 5 Year Warranty

– Made In Canada

Our Price: $203.00

$162.40

Retail Price $399.00

Out of stock

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+ Learn More About Open Bag items

+ Full Manufacturer’s Warranty

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OPEN BAG - NM HD 6" Extra-Firm High Density Foam Mattress - Twin XL

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Traditional, Foam Core/No Coils, Twin XL Size Mattress, NM Mattress Sale, Buy in Toronto, Mississauga, Markham or Online-1

Traditional, Foam Core/No Coils, Twin XL Size Mattress, NM Mattress Sale, Buy in Toronto, Mississauga, Markham or Online-2

Traditional, Foam Core/No Coils, Twin XL Size Mattress, NM Mattress Sale, Buy in Toronto, Mississauga, Markham or Online-3

Traditional, Foam Core/No Coils, Twin XL Size Mattress, NM Mattress Sale, Buy in Toronto, Mississauga, Markham or Online-4

Traditional, Foam Core/No Coils, Twin XL Size Mattress, NM Mattress Sale, Buy in Toronto, Mississauga, Markham or Online-5

Traditional, Foam Core/No Coils, Twin XL Size Mattress, NM Mattress Sale, Buy in Toronto, Mississauga, Markham or Online-6

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Style	Traditional, Foam Core/No Coils
Firmness	Extra Firm
Coil Count	N/A
Coil Type	N/A
Core Type	NM® HD+™ Extra-Firm High Density Support Core
Core Density	1.8 lb/ft³
Height	6 Inches

Collection	NM® HD+™ Core
Model	High Density Classic 6" - Extra Firm - Twin XL
Warranty	5 Year Warranty
Condition	Open Bag Item - Clearance

Comfort Scale

Soft
Medium
Firm
Extra Firm

Comfort IQ™: This mattress is slightly softer compared to other extra-firm mattresses. (9/10)

Recommended For: Back Sleepers, Stomach Sleepers

Our Guarantees

+ Learn More About Open Bag items

+ Full Manufacturer’s Warranty

+ Price Match Guarantee

+ Made in Canada

➜ Not sure which mattress is best for you? Try our MATTRESS SELECTOR to help you decide!

➜ See our REVIEWS from verified customers!

Description

Open Bag - NM HD 6" Extra-firm High-Density Foam Mattress - Unmatched Support Awaits

Ready to elevate your sleep experience? The NM HD 6" Extra-Firm High-Density Foam Mattress is designed for those who prioritize steadfast support without sacrificing comfort. Engineered with a high-density foam core, it resists sagging, ensuring that your mattress retains its shape and durability for years. Each night, indulge in a rejuvenating rest with the perfect blend of stability and luxury.

Key Features

High Density Foam Core: Experience strong, unwavering support that effectively absorbs movement, making it ideal for light sleepers who share their bed.
Contouring Comfort Layer: The 2" HD+ comfort layer adapts to your unique body shape, relieving stress on pressure points while promoting a healthy spinal alignment.
Breathable Quilted Cover: Crafted from a soft cotton blend, the cooling quilted cover enhances airflow, keeping you comfortable throughout the night, even in warmer environments.
Edge Guard Technology: This feature fortifies the edges, bolstering stability so you can use the entire surface without concern for sagging.
Crafted in Canada: Benefit from exceptional quality with products made to meet rigorous local standards, ensuring safety and longevity.

Benefits

Firm Yet Comfortable: With a firmness rating of 9/10, this mattress is perfect for back and stomach sleepers, as well as children needing solid support for healthy growth.
Durable Construction: High-density foam provides reliable edge-to-edge support, making every inch of the mattress usable and comfortable.
Space-Saving Design: Measuring just 6 inches in height, this mattress is ideal for compact spaces like bunk beds, Murphy beds, and mobile homes.
Generous Guarantees: Enjoy full peace of mind with free next-day delivery, a 100 Night comfort commitment, and a comprehensive manufacturer warranty.

Ideal For

Whether you're setting up a child’s room, furnishing a college dorm, or seeking a versatile mattress that pairs seamlessly with an adjustable base, the NM HD 6" Extra-Firm Mattress fits perfectly into any living situation.

Details

Dimensions: 38″ x 80″ (inches) – 96.5cm x 203cm (centimeters)
Profile Height: 6 Inches
Firmness: Extra Firm
Warranty: 5-Year Limited Warranty
Guarantees: Free next-day delivery, 100 night sleep trial, full manufacturer’s warranty, price match guarantee
Certifications: CertiPUR-US certified foams to ensure a safe sleep environment.

Embrace a new way to rest with the NM HD 6" Extra-Firm High-Density Foam Mattress! Delivered quickly from our Canadian facility, enjoy the assurance of exceptional craftsmanship designed to provide lasting comfort. Rediscover what restful sleep feels like—it’s time to indulge in the support you deserve every night!

Specifications

More Information
Mattress Size	Twin XL
Mattress Type	Traditional , Foam Core/No Coils
Features	Low Motion Transfer , Edge Support, Compatible with Adjustable Bed Base, Mattress In A Box
Trending & Offers	Clearance , Limited Stock
Firmness	Extra Firm
Core Type	NM® HD+™ Extra-Firm High Density Support Core
Core Density	1.8 lb/ft³
Core Material	Polyurethane (polyfoam)
Brands	NM
Price Range	Great Value
Model	High Density Classic 6" - Extra Firm - Twin XL
Collection	NM® HD+™ Core
Condition	Open Bag Item - Clearance
Warranty	5 Year Warranty
Sleep Position	Back Sleepers, Stomach Sleepers
Cover Material	Breathable Cotton Blend
Colour	Grey
Quilt	Dual Sided Cotton Support Quilt
Comfort Layers	2" HD+™ High Density Foam X2
Support Layers	Center & Lumbar Support
Mattress Core	Extra Firm High Density Foam Core
Mattress Height in Inches	6 .00 Inches
Additional Features	Edge Guard
Certifications	CertiPUR-US® certified foams.
Compatible With Adjustable Beds	No
Vented	No
Removable Cover	No
Handles	No
Care Instruction	Spot clean. Mattress protector recommended.
Country of Origin	Canada
Single/Twin XL Size Dimensions	38″ x 80″ (inches) – 96.5cm x 203cm (centimeters)
Custom Sizes Available	No
Product Length (inches)	80 in
Product Width (inches)	38 in
Product Height (inches)	6 in
Product Weight (lb)	36.200000
Product Length (cm)	203.2 cm
Product Width (cm)	96.5 cm
Product Height (cm)	15.2 cm
Product Weight (kg)	16.4 kg
Product Barcode	628719062500
Product Model Code	NM-6-HDCLASSIC
Product SKU	NM-6-HDCLASSIC-TWINXL-OPENBAG
Product Category	Mattress
Product Sub Category Tier	Value
Product Type	Mattress - Foam Core
Product Sub Type	Traditional - Tight-Top

More Info.

For more information please contact National Mattress Outlet Plus+.

Delivery Options

Greater Toronto Area and Ontario Delivery Map

What’s Included

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.

Greater Toronto Area and Ontario Free Mattress Delivery Map

Ontario Local Delivery Areas

Next‑day available

Halton Region

Burlington • Oakville • Milton • Georgetown • Halton Hills

Next‑day available

Peel Region

Mississauga • Brampton • Caledon

Next‑day available

City of Toronto

York • Including Downtown Core

Next‑day available

York Region

Vaughan • King • Richmond Hill • North York • Aurora • Newmarket • Markham • Scarborough

Next‑day available

Durham Region

Pickering • Ajax • Whitby • Oshawa • Whitchurch‑Stouffville

Next‑day available

Waterloo Region

Guelph • Kitchener • Cambridge • Waterloo

Next‑day available

Hamilton

Including Dundas • Grimsby • Stoney Creek • Ancaster

1–3 days on average

Niagara

Niagara Falls • Niagara‑on‑the‑Lake • St. Catharines • Thorold • Welland

Next‑day & 1–3 days

Simcoe Region

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.

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Frequently Asked Questions

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?

No. We currently do not deliver to YT, NU, or NT.

Need help? 1‑800‑631‑4883 [email protected]

Product Questions (26)

Customer Questions

What are the exact dimensions of this 6 inch mattress?

Does this Twin XL mattress come rolled or boxed?

Many modern Twin XL mattresses are shipped compressed and rolled in a box for easier delivery and setup. Check the product details for packaging information and follow the unboxing instructions to allow the mattress to expand fully.

Is this mattress appropriate if I have back, neck, or circulation issues?

This mattress is designed to flex with an adjustable base and provide consistent support in various positions, which may help with certain back, neck, or circulation concerns. However, specific conditions vary review the firmness and support details...

Is this Twin XL mattress comfortable for everyday use?

This Twin XL mattress is designed for regular, nightly use with a balance of comfort and support suitable for its intended sleeper group (such as teens, college students, guests, or adults). Check the firmness rating, materials, and customer reviews...

Is this mattress suitable for side, back, or stomach sleepers?

This mattress in a box has a specific firmness and support profile tuned for certain sleep positions. Check the comfort description and any recommended sleep positions in the product details to see whether it's best for side, back, stomach, or combination...

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.

How should I care for and clean this mattress?

Use a mattress protector to guard against spills and stains, vacuum the surface occasionally to remove dust, and follow the manufacturer's spot-cleaning instructions for any accidents. Avoid harsh chemicals or saturating the mattress with liquid, and...

Is this foam mattress suitable for couples with different comfort preferences?

This foam mattress is designed with a balanced comfort and support profile that many sleepers find comfortable, but it may still favor certain preferences. Review the firmness rating, motion isolation information, and customer feedback to see how well...

What type of core does this edge support mattress use (foam, coils, or latex), and how does that impact edge stability?

This mattress uses a support core made from coils, foam, latex, or a combination, along with edge reinforcements tuned to that core type. Check the construction section to see how the core and edge support system work together to provide stability along...

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 available in sizes suitable for both single and coupled back sleepers?

This mattress is available in a range of sizes, from Twin or Twin XL for single sleepers up to Queen and King for couples. Choose the size that best fits your sleeping arrangements and bedroom layout.

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...

Is this Twin XL 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 Twin XL mattresses described as medium or medium-soft with contouring comfort layers that adapt to the body's curves.

Does this tight top mattress have cooling features?

This tight top mattress incorporates materials and design elements such as breathable cover fabrics, ventilated foams, or coil support to help manage temperature. Check the product description for specific cooling features included in this model.

Is this mattress delivered as a rolled mattress?

Yes, this mattress is compressed, rolled, and shipped in a box for convenient delivery. Check the delivery and packaging section for box dimensions, approximate weight, and any setup guidelines specific to this model.

Is this mattress an all-foam model or a hybrid with springs?

This mattress is an all-foam design, built entirely with foam layers for both support and comfort, without any metal coil support system. You can confirm this in the construction and materials section, which will list only foam and related comfort layers...

How does this firm model compare in feel to your medium-firm and plush models?

This firm mattress feels more supportive and flatter at the surface than our medium-firm models, and significantly less cushioned than our plush models. If you prefer a solid, on top of the bed feel, this firm option is designed to be the most supportive...

Is this mattress suitable for an adjustable base?

Many extra-firm mattresses especially foam and certain hybrid designs are compatible with adjustable bases and are built to bend and flex as the base moves. Check the product description for specific notes on adjustable base compatibility and follow...

Can this mattress be used as my primary bed for the long term?

Yes, this mattress in a box is designed for regular nightly use when matched with the right base and care. Review the durability details, warranty coverage, and recommended maintenance practices to see how it is intended to perform as a long-term primary...

Is this Twin XL mattress supportive enough for a heavier sleeper?

Heavier sleepers typically need stronger support so they don't sink too deeply into the mattress. Check the product description for higher-density foams, reinforced coils, or weight capacity guidelines, and consider a medium-firm to firm feel for proper...

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...

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