King Medium Firm Compatible with Adjustable Bed Adjustable Bed Compatible 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.
Medium-firmness mattresses — often called medium-firm — sit right between plush and firm, which is why they're the most popular and versatile feel we carry. You get enough cushioning to relieve pressure with enough support to keep your spine aligned, making medium a safe choice for back sleepers, combination sleepers who change positions through the night, and couples who need a compromise between two preferences. Shop medium models from Sealy, Serta, Beautyrest, Stearns & Foster, iComfort and Tempur-Pedic across memory foam, hybrid, euro-top, pillow-top and tight-top builds — with free delivery across Canada. • Feel: medium sits between plush and firm — balanced and the most versatile of our four comfort levels • Also called "medium-firm" — the middle of the firmness scale • Best for: back sleepers, combination sleepers, couples, and most body types • Consider plush if you sleep on your side; firm if you sleep on your stomach or want more support • Constructions: euro-top, tight-top, pillow-top, memory foam and hybrid • Brands: Sealy, Serta, Beautyrest, Stearns & Foster, iComfort, Tempur-Pedic, Springwall & NM • Prices: from $171 to premium
Firm mattresses give you the most support of our everyday comfort levels — a solid, stable surface that keeps your spine aligned instead of sinking in. Firm is the go-to for back and stomach sleepers, heavier-weight sleepers who need extra support, and anyone looking for orthopedic, back-friendly comfort; side sleepers or those who like a softer feel may prefer our medium or plush options. Choose from tight-top, foam, euro-top and hybrid builds across Sealy, Serta, Beautyrest, Stearns & Foster, iComfort, Tempur-Pedic, Chirofoam and our own NM line — from budget-friendly models at $59 to premium, with free delivery across Canada. • Feel: firm gives a solid, supportive surface with minimal sink-in • Best for: back and stomach sleepers, heavier-weight sleepers, and orthopedic / back-pain support • Consider softer if you sleep on your side or want more cushioning — see our medium or plush options • Constructions: tight-top (most firm beds), foam, euro-top and hybrid • Brands: Sealy, Serta, Beautyrest, Stearns & Foster, iComfort, Tempur-Pedic, Chirofoam, Springwall & NM • Prices: from $59 (budget) to premium — our widest price range • Want the firmest feel? See our extra-firm mattresses
Not every mattress can bend with an adjustable base — but these can. Every mattress here is built to flex with the head and foot articulation of an adjustable base without damaging the comfort layers, so you can read, relax in Zero-Gravity or elevate your legs with confidence. In fact, over 90% of our mattresses are adjustable-compatible, spanning memory foam, hybrid and pocket-coil constructions from every brand — NM, Sealy, Serta, Beautyrest, Tempur-Pedic, Stearns & Foster and more — at every budget from about $109 to premium. Foam and hybrid models flex most easily, while rigid, thick tight-top innersprings generally don't. Pair any of these with one of our adjustable bases, and every mattress comes with a 365-night sleep trial and free delivery across Canada. • What this means: mattresses built to flex with an adjustable base's head & foot articulation • Over 90% of our mattresses are adjustable-compatible — every brand, every budget ($109+) • Best constructions for adjustable bases: memory foam, hybrid and pocket-coil • What usually won't work: rigid, thick tight-top innersprings that don't bend • Pairs with our adjustable bases (including split-king for independent sides) • 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 Medium Firm Compatible with Adjustable Bed Adjustable Bed Compatible Mattresses Edge Support Mattresses Mattress Selector

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Clear all King Medium Firm Compatible with Adjustable Bed Compatible with Adjustable Bed Base Edge Support

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King Medium Firm Compatible with Adjustable Bed Compatible with Adjustable Bed Base Edge Support Clear all
  • NM Orthopedic Classic 8" Firm Flippable Tight Top Mattress
    BEST IN CLASS TOP RATED TRENDING
    National Mattress Orthopedic Classic 8-inch firm tight-top mattress, all-white quilted cover with dark piping NM Logo
    FIRM
    • Double Tempered Bonnel Coil with Edge Guard
    • Firm BioComfort™ Foam
    • Center & Lumbar Support
    • Dual Sided Cotton Support Quilt
    • 5 Year Warranty
    • Made In Canada
    King In stock for fast delivery $296
    Compare at $599
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  • SPRINGWALL® 6" Medium Firm Tight Top Foam Mattress
    BEST IN CLASS TOP RATED TRENDING
    Springwall 6-inch medium-firm tight-top foam mattress with patterned white quilted cover and charcoal sides Springwall Foam Mattress Collection Logo
    MEDIUM
    • Bio Comfort Foam Core
    • Gel Quilt Foam
    • Stretch Knit
    • Reduced Motion Transfer
    • Made In Canada
    King In stock for fast delivery $381
    Compare at $799
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  • SPRINGWALL® Chiro Medic® 8" Firm Tight Top Mattress
    BEST IN CLASS TOP RATED TRENDING
    Springwall Chiro Medic 8-inch firm tight-top mattress, white damask top, black sides, grey piping Springwall Chiromedic Mattress Logo
    FIRM
    • 700 Continuous Coil
    • Bio-Foam Comfort Foam
    • Bio Comfort Quilted Stretch knit surface
    • SpringWALL Edge System
    • Pressure Balancing Design
    King In stock for fast delivery $391
    Compare at $899
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  • NM Orthopedic 9.5" Firm Euro Top Mattress
    BEST IN CLASS BEST SELLING TOP RATED
    National Mattress 9.5-inch firm euro-top mattress, white diamond-quilted top with black quilted sides NM Logo
    FIRM
    • Double Tempered Bonnel Coil with Edge Guard
    • Center & Lumbar Support
    • Bio Foam Comfort Layers
    • 5 Year Warranty
    • Made In Toronto, Canada
    King In stock for fast delivery $396
    Compare at $699
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  • SPRINGWALL® Chiro Medic® 8.5" Medium Firm Eurotop Mattress
    FLASH SALE BEST IN CLASS TOP RATED
    Springwall Chiro Medic 8.5-inch medium-firm euro-top mattress, white quilted top, dark sides, silver piping Springwall Chiromedic Mattress Logo
    MEDIUM
    • 700 Continuous Coil
    • Bio-Foam Comfort Foam with Gel
    • Bio Comfort Quilted Stretch knit surface
    • SpringWALL Edge System
    • Pressure Balancing Design
    King In stock for fast delivery $428
    Compare at $899
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  • SPRINGWALL® 7" Medium Firm Tight Top Foam Mattress
    BEST IN CLASS TRENDING LIMITED STOCK
    Springwall 7-inch medium-firm tight-top foam mattress, white cover with grey cloud motifs and charcoal quilted sides Springwall Foam Mattress Collection Logo
    MEDIUM
    • Bio Comfort Foam Core
    • Gel Quilt Foam
    • Convoluted Bio Comfort Foam
    • Reduced Motion Transfer
    • Made In Canada
    King $476
    Compare at $999
    Online availability icon Backorder Available
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  • NM Hi-Loft 10" Medium Firm Euro Top Mattress
    BEST IN CLASS BEST SELLING TOP RATED
    National Mattress 10-inch medium-firm euro-top mattress, white quilted top, tall black patterned sides NM Hi-Loft Collection Logo
    MEDIUM
    • 800 Hi-Loft Pocket Coil
    • Cool Gel infused memory foam
    • Luxurious Knit Fabric
    • 10 Year Warranty
    • Made In Toronto, Canada
    King In stock for fast delivery $535
    Compare at $1,099
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  • SPRINGWALL® Comfort Pockets® 10" Firm Euro-Top Mattress
    BEST IN CLASS BEST SELLING TOP RATED
    Springwall Comfort Pockets 10-inch firm euro-top mattress, plain white quilted top with charcoal diamond-quilted sides Springwall Comfort Pockets Mattress Logo
    FIRM
    • 884 Full Perimeter Comfort Pockets® (Pocket Coils)
    • Bio Foam with Gel
    • Cool Touch Stretch Knit Sleep Surface
    • Bio Comfort Quilted Stretch knit surface
    • Made In Canada
    King In stock for fast delivery $544
    Compare at $1,199
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  • SEALY® Essentials 6" Firm Tight Top Foam Mattress
    BEST IN CLASS TOP RATED TRENDING
    Sealy Essentials 6-inch firm tight-top foam mattress, quilted blue-grey top, white sides, navy piping Sealy Essentials Mattress Logo
    FIRM
    • CleanProtect™ Fabric
    • SealyLoft™ Quilt with Moisture Wicking Fibres
    • CertiPUR-US™ SealySupport™ HD Foam
    • CertiPUR-US™ SealySupport™ HD Core
    • SealySupport™ HD Foam
    King In stock for fast delivery $566
    Compare at $1,299
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  • NM Cozy 8" Medium Firm Memory Foam Mattress
    CLEARANCE FLASH SALE BEST IN CLASS
    National Mattress 8-inch medium-firm memory-foam mattress, smooth white tight-top, charcoal sides, NM badge NM Cozy Collection Logo
    MEDIUM
    • High Density Foam Core
    • Cool Gel Memory Foam
    • Hypoallergenic Bamboo Cover
    • 10 Year Warranty
    • Made In Toronto, Canada
    King In stock for fast delivery $579
    Compare at $1,199
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  • NM® Hi-Loft™ Elite 10" Firm Euro Top Mattress
    BEST IN CLASS BEST SELLING TOP RATED
    National Mattress 10-inch firm euro-top mattress, white wave-quilted top with black diamond-patterned sides NM Hi-Loft Collection Logo
    FIRM
    • 1000 Hi-Loft Pocket Coil with Foam Encased Perimiter
    • Cool Gel-infused memory foam
    • Bio-Foam natural foam content reduces your carbon footprint
    • 10 Year Warranty
    • Made In Toronto, Canada
    King In stock for fast delivery $581
    Compare at $1,099
    Online availability icon In-Stock Only 5 left!
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  • NM Orthopedic Supreme 13" Firm Flippable Tight Top Mattress
    BEST IN CLASS TOP RATED TRENDING
    National Mattress Orthopedic Supreme 13-inch firm tight-top mattress, white top, grey-black diamond sides NM Logo
    FIRM
    • Double Tempered Bonnel Coil with Edge Guard
    • HD+™ High Density Foam
    • Center & Lumbar Support
    • Dual Sided Cotton Support Quilt
    • 10 Year Warranty
    • Made In Canada
    King In stock for fast delivery $587
    Compare at $1,099
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Upgrade your sleep at National Mattress

Discover a mattress that transforms your sleep into a truly rejuvenating experience. We offer a wide variety of options to suit every sleep style and preference, ensuring a better night's sleep.

Why Choose Us?

  • Variety: From plush to firm, we have options for every body type and sleep style.
  • Quality: Trusted brands and top-notch materials for long-lasting comfort.
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  • Expert Advice: Get personalized recommendations from our sleep specialists.

Mattress Selection Includes

  • Memory Foam: Contours to your body for personalized comfort and pressure relief.
  • Hybrid: Combines responsive springs with foam for balanced support and comfort.
  • Innerspring: Provides firm support, bounce, and cooling airflow.
  • Latex: Hypoallergenic, eco-friendly, and exceptionally comfortable.
  • Adjustable Beds: Customize your sleep position for optimal comfort.
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