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King Memory Foam Compatible with Adjustable Bed Adjustable Bed Base Friendly Temperature-Regulating Mattresses Edge Support Mattresses Mattress Selector

King mattresses measure 76" × 80" — the widest standard size, giving each partner the same personal space as a twin. They're the top choice for couples who want maximum room, families who co-sleep, and larger master bedrooms. Compare every king option below by brand, feel, and price.
Memory foam mattresses contour to your body, relieving pressure at the hips and shoulders while absorbing motion so you won't feel your partner move. They give a cradling, "hug" feel that suits side sleepers and couples. Browse every memory foam option below by brand, feel, and profile.
Shop adjustable base friendly mattresses from Beautyrest, Serta, Sealy, Tempur-Pedic, Springwall, iComfort, and Stearns & Foster at National Mattress — 169+ models in memory foam, hybrid, latex, eurotop, and tight-top constructions from $59 to $6,640. Every mattress in this collection is manufacturer-verified to flex and articulate with an adjustable base without voiding the warranty. Available in Twin through King sizes with firmness levels from extra firm to plush, all built with CertiPUR-US® certified foams, including Canadian-made options. Free delivery is available, along with a 365-night sleep trial and 5–15 year warranty coverage.
A temperature-regulating mattress works to keep you at a comfortable, balanced temperature all night and all year — not just cooling you down, but adapting as your body and the seasons change so you don't wake up too hot or too cold. These mattresses use heat-responsive and breathable materials — phase-change covers, gel and graphite foams, Tencel and natural fibres, and airflow-promoting coils — to absorb and release warmth as needed. It's ideal if you run hot and cold, share a bed with a partner who sleeps at a different temperature, or just want consistent comfort through every season. You'll find temperature-regulating builds across every brand — Sealy, Serta, Beautyrest, iComfort, Tempur-Pedic, Chirofoam and our own NM line. Sleep hot specifically? See our cooling mattresses. Every mattress includes a 365-night sleep trial and free delivery across Canada. • What it does: holds a balanced, neutral temperature — adapts so you're not too hot or too cold • How it works: phase-change covers, gel & graphite foams, Tencel/natural fibres and breathable coil airflow • Best for: people who run hot and cold, couples with different sleep temperatures, and year-round comfort • Cooling vs regulating: cooling sleeps cold (for hot sleepers); regulating holds a steady, balanced temp • Across every brand and firmness • Every order: 365-night sleep trial, price-match guarantee & free Canada-wide delivery
Edge support mattresses are reinforced around the perimeter so the edge feels as solid as the middle — you can sleep right up to the side without that sinking, roll-off feeling, sit on the edge to get dressed without it caving, and use the full surface of the bed. It's a feature that matters most for couples sharing the space, anyone who sits on the edge to get in and out of bed, and heavier-weight sleepers. These are mostly our pocket-coil and hybrid mattresses with full-perimeter coils or foam-encased edges — from Springwall (Full Perimeter Comfort Pockets), Sealy, Serta, Beautyrest, iComfort, Stearns & Foster and our own NM line. Every mattress includes a 365-night sleep trial and free delivery across Canada. • What it does: a reinforced perimeter so the edge stays firm — no sinking or rolling off • Why it matters: more usable sleep surface, easier to sit on the edge and get in and out of bed • Best for: couples sharing space, anyone who sits on the edge, and heavier-weight sleepers • How it works: full-perimeter pocket coils or foam-encased edges (mostly coil & hybrid; all-foam edges are softer) • Brands: Springwall (Full Perimeter Comfort Pockets), Sealy, Serta, Beautyrest, iComfort, Stearns & Foster & NM • Every order: 365-night sleep trial, price-match guarantee & free Canada-wide delivery
King Memory Foam Compatible with Adjustable Bed Adjustable Bed Base Friendly Temperature-Regulating Mattresses Edge Support Mattresses Mattress Selector
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Items

  • National Mattress 8-inch medium-firm memory-foam mattress, smooth white tight-top, charcoal sides, NM badge NM Cozy Collection Logo
    • High Density Foam Core
    • Cool Gel Memory Foam
    • Hypoallergenic Bamboo Cover
    • 10 Year Warranty
    • Made In Toronto, Canada
    King In stock for fast delivery $371
    Compare at $1,199
    Online availability icon In-Stock Only 4 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery to M5H 2N1 as soon as Tomorrow, Sep 28
    Pickup available icon Only Pickup available to
    M5H 2N1
  • Serta Modern Series 8-inch medium-firm gel foam mattress, low-profile white geometric cover, navy base Serta Modern Series Memory Foam Mattress Logo
    • 8 Inch Model with Double Layers of Comfort
    • Serta CoolWick Breathable Cover
    • PureComfort Gel Foam with PureComfort Foam Support Core
    • Designed and Built in Canada
    King $653
    Compare at $1,499
    Online availability icon Backorder Available
    In-Store availability icon On Display:
    Estimated delivery icon Estimated free delivery to M5H 2N1 as soon as Sun, Oct 11
  • National Mattress 12-inch medium-firm memory-foam mattress, tall white channel-quilted top, grey woven sides NM Cozy Collection Logo
    • Optimal High Resilient Bio-Foam Core
    • Gel Infused Visco Memory Foam
    • Cotton Channel Quilted Cover
    • 10 Year Warranty
    • Made In Toronto, Canada
    King In stock for fast delivery $719
    Compare at $1,799
    Online availability icon In-Stock Only 2 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery to M5H 2N1 as soon as Tomorrow, Sep 28
    Pickup available icon Only Pickup available to
    M5H 2N1
  • National Mattress 10-inch firm memory-foam mattress, white channel-quilted tight-top, grey woven sides NM Cozy Collection Logo
    • Optimal High Resilient Bio-Foam Core
    • Visco Memory Foam
    • Pressure Relieving Comfort Foam
    • Cotton Channel Quilted Cover
    • 10 Year Warranty
    • Made In Toronto, Canada
    King In stock for fast delivery $749
    Compare at $1,599
    Online availability icon In-Stock Only 2 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery to M5H 2N1 as soon as Tomorrow, Sep 28
    Pickup available icon Only Pickup available to
    M5H 2N1
  • Sealy Cocoon 8-inch medium-firm memory foam mattress, white swirl-pattern top, black sides, Cocoon logo Sealy Cocoon Memory Foam Mattress Logo
    • Premium Fabric Cover
    • Perfect Fit Memory Foam
    • Personalized Comfort Layer
    • Essential Support Foam
    • 10 Year Warranty
    King In stock for fast delivery $759
    Compare at $2,399
    Online availability icon In-Stock Only 2 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery to M5H 2N1 as soon as Tomorrow, Sep 28
    Pickup available icon Only Pickup available to
    M5H 2N1
  • Serta Modern Series 10-inch extra-firm gel foam mattress, white geometric cover, navy fabric base Serta Modern Series Memory Foam Mattress Logo
    • 10 Inch Model with Double Layers of Comfort
    • Serta CoolWick Breathable Cover
    • PureComfort Gel Foam with PureComfort Foam Support Core
    • Designed and Built in Canada
    King In stock for fast delivery $765
    Compare at $1,799
    Online availability icon In-Stock Only 3 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery to M5H 2N1 as soon as Tomorrow, Sep 28
    Pickup available icon Only Pickup available to
    M5H 2N1
  • Serta Modern Series 10-inch medium-firm gel foam mattress, white geometric cover on navy fabric base Serta Modern Series Memory Foam Mattress Logo
    • 10 Inch Model with Double Layers of Comfort
    • Serta CoolWick Breathable Cover
    • PureComfort Gel Foam with PureComfort Foam Support Core
    • Designed and Built in Canada
    King $765
    Compare at $1,799
    Online availability icon Backorder Available
    In-Store availability icon On Display:
    Estimated delivery icon Estimated free delivery to M5H 2N1 as soon as Sun, Oct 11
  • Chirofoam XF 10-inch extra-firm memory foam mattress, white geometric-knit top, pale blue edge, navy sides Chirofoam Logo
    • Cool Gel Infused Memory Foam
    • Extra Firm Support Chirofoam
    • Pro Lumbar Support
    • Body Support Bio Foam Core
    • 15 Year Warranty
    King In stock for fast delivery $954
    Compare at $1,699
    Online availability icon In-Stock Only 7 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery to M5H 2N1 as soon as Tomorrow, Sep 28
    Pickup available icon Only Pickup available to
    M5H 2N1
  • Chirofoam 12-inch luxury-firm memory foam mattress, smooth white knit top, pale blue edge, navy sides Chirofoam Logo
    • Cool Gel Infused Memory Foam
    • Firm Support Chirofoam
    • Pro Lumbar Support
    • Body Support Bio Foam Core
    • 15 Year Warranty
    King In stock for fast delivery $1,108
    Compare at $1,999
    Online availability icon In-Stock Only 4 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery to M5H 2N1 as soon as Tomorrow, Sep 28
    Pickup available icon Only Pickup available to
    M5H 2N1
  • Sealy Cocoon 10-inch firm memory foam mattress, white pebbled knit top, black Cocoon side band Sealy Cocoon Memory Foam Mattress Logo
    • Premium Fabric Cover
    • Perfect Fit Memory Foam
    • Personalized Comfort Layer
    • Essential Support Foam
    • 10 Year Warranty
    King $1,273
    Compare at $2,999
    Online availability icon Backorder Available
    In-Store availability icon On Display:
    Estimated delivery icon Estimated free delivery to M5H 2N1 as soon as Fri, Oct 23
  • Sealy Cocoon 10-inch plush memory foam mattress, white pebbled knit top, charcoal Cocoon side band Sealy Cocoon Memory Foam Mattress Logo
    • Premium Fabric Cover
    • Perfect Fit Memory Foam
    • Personalized Comfort Layer
    • Essential Support Foam
    • 10 Year Warranty
    King $1,273
    Compare at $2,999
    Online availability icon Backorder Available
    In-Store availability icon On Display:
    Estimated delivery icon Estimated free delivery to M5H 2N1 as soon as Fri, Oct 23
  • Sealy Posturepedic Luxury 13.5-inch medium-firm hybrid mattress, grey wavy tight-top, black sides, blue badge Sealy Posturepedic Luxury Mattress Logo
    • SealyCool™ Fabric Premium Ultra-Stretch Cover
    • Silhouette™ Memory Foam
    • SealyMAX™ Core System featuring SealyResponse™ PRO & SolidSupport™ Pocket Coils
    • SolidEdge™ PRO Coil Edge
    • Sealy ComfortSense™ Memory Foam with SealyCool™
    • Zoned Pocket Coil Support
    King $1,812
    Compare at $4,299
    Online availability icon Backorder Available
    In-Store availability icon On Display:
    Estimated delivery icon Estimated free delivery to M5H 2N1 as soon as Fri, Oct 23

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How the Mattress Selector Works

The selector asks the questions a good salesperson asks in the first two minutes — who the bed is for, your sleep position, your body type, where you ache, how warm you sleep, the feel you prefer, whether you want a pillow top, and (optionally) your budget — then uses your answers to narrow the range down to a shortlist. It draws on the same mattresses you can browse by hand, including Beautyrest, Serta, Sealy, Springwall, Tempur-Pedic and Stearns & Foster.

Answer the feel question honestly rather than aspirationally — if you’ve slept well on firm beds your whole life, say firm. Side sleepers generally need more give at the shoulder and hip, back and stomach sleepers want less sink so the spine stays neutral, and body weight changes how deeply any mattress compresses — which is why two people can lie on the same bed and honestly call it soft and firm. Whatever the selector suggests is a starting point, not a verdict: you can lie on the result at any of our seven Ontario showrooms, and every mattress it recommends carries the 365-night sleep trial.

A Filter, Not an Oracle

It narrows the full mattress range to a shortlist using what you tell it about how you sleep — treat the result as a starting point for browsing, not a verdict.

Matched to How You Sleep

Sleep position drives support needs: side sleepers generally need more give at the shoulder and hip, while back and stomach sleepers usually do better with less sink.

Protected by the 365-Night Trial

No form can know how a bed feels after three weeks — the 365-night sleep trial covers that part. Every mattress it recommends carries the trial, clearance and discontinued stock excepted — that’s sold as-is.

No Commission, No Steering

Our sleep experts aren’t paid commission — they earn the same whichever mattress you pick, and the same whether you buy today or not.

Frequently Asked Questions About the Mattress Selector

What does the mattress selector ask?
Who the bed is for, your sleep position, your body type, where you ache, how warm you sleep, the feel you prefer, whether you want a pillow top, and your budget. Budget is optional — leave it blank and you’ll still see a range of matches.
Is the mattress quiz accurate?
It’s accurate about what it can measure and silent about the rest. It narrows the field using what you told it about position, body type and feel — but it can’t tell you which of three well-matched mattresses you’ll personally love. Only lying on them can, which is what our showrooms and the 365-night sleep trial are for.
Will it push me toward expensive mattresses?
Nobody here earns more for selling you a dearer bed — our staff aren’t paid commission. What’s true is that better-built mattresses tend to cost more, so a shortlist weighted toward quality can skew upward. If that happens, set a budget and run it again, or sort the results by price and work from the other end.
Do I have to use the selector to shop?
No. If you already know what you want, browse all mattresses directly and filter by feel — plush to extra firm — by type like memory foam or hybrid, or by size. The selector exists for the much more common case of not knowing where to start.
Can I try my recommendation in person?
Yes — find your nearest of our seven Ontario showrooms and lie on your shortlist. Floor models are shared across the network: if a style is on display at any one store, its sizes are available to order company-wide, stock permitting.
What if the recommendation turns out to be wrong?
Then it’s wrong, and the 365-night sleep trial is how you fix it. A mattress needs a few weeks to break in and your body needs a few weeks to adjust — any trial short enough to expire before that has happened isn’t much of a trial.

Prefer to Browse — or Talk to a Person?

The selector is a shortcut, not a requirement. Browse the full range at your own pace, or visit a showroom and tell a non-commissioned sleep expert how you sleep — they do the same narrowing by hand, with better follow-up questions than any form can ask.

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