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Medium Compatible with Adjustable Bed Adjustable Bed Base Friendly Temperature-Regulating Mattresses Marshall® Handcrafted Luxury Mattresses

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
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

Marshall® is a Canadian name in handcrafted, pocketed-coil sleep. Each Marshall mattress is built in Canada on an 842 tempered pocketed-coil system with high-density encased edge support, spanning the Crafted and Assured series in medium, firm and plush feels, plus matching boxsprings to complete your set. Read our manufacturer warranty information and delivery information before ordering.

Medium Compatible with Adjustable Bed Adjustable Bed Base Friendly Temperature-Regulating Mattresses Marshall
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  • Sealy Posturepedic Luxury 14.5-inch medium-firm hybrid euro-top mattress, quilted white top, charcoal sides Sealy Posturepedic Luxury Mattress Logo
    • SealyMAX™ Core System featuring SealyResponse™ PRO & SolidSupport™ Pocket Coils
    • GelSense™ MAX Memory Foam
    • SealySupport™ Gel HD Foam
    • SupremeLoft™ Quilt featuring Silk & Wool
    • SealyCool™ Fabric
    • SolidEdge™ PRO Coil Edge
    Twin XL $1,066
    Double/Full In stock for fast delivery $1,082
    Queen $1,175
    Compare at $2,799
    King $1,371
    Online availability icon In-Stock Only 1 left!
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  • Sealy Posturepedic 800 Series 13-inch medium-firm euro-top mattress, deeply tufted grey-blue top, grey sides Sealy Posturepedic Mattress Logo
    • CleanProtect™ Fabric
    • Quilt Stay True® Quilt with MoistureProtect™ Fibres
    • CertiPUR-US™ SealySupport™ Gel HD Foam
    • Posture Touch® Pocket Coils
    • StableEdge™ HD
    • Targeted Gel HD Foam
    Single/Twin $491
    Twin XL $566
    Double/Full $575
    Queen $642
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    King $904
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  • Evergreen 12-inch tight-top medium-firm organic latex mattress, white button-tufted top, sage piped border Evergreen Sleep Organic Latex Mattress Collection Logo
    • 1000 Hi-Loft Pocket Coil with Foam Encased Perimeter
    • Organic Latex Comfort Layer
    • Bio-Foam natural foam content support layers
    • Organic Cotton Quilt with Organic Latex and Organic Wool
    • 10 Year Warranty
    • Made In Toronto, Canada
    Single/Twin $402
    Twin XL In stock for fast delivery $548
    Double/Full In stock for fast delivery $556
    Queen In stock for fast delivery $645
    Compare at $1,199
    King In stock for fast delivery $840
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  • National Mattress 10-inch medium-firm euro-top mattress, white quilted top, tall black patterned sides NM Hi-Loft Collection Logo
    • 800 Hi-Loft Pocket Coil
    • Cool Gel infused memory foam
    • Luxurious Knit Fabric
    • 10 Year Warranty
    • Made In Toronto, Canada
    Single/Twin SOLD OUT
    Double/Full In stock for fast delivery $365
    Queen $387
    Compare at $899
    King In stock for fast delivery $535
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  • National Mattress 12-inch medium-firm euro-top mattress, white quilted dome top, black diamond-quilted sides NM Hi-Loft Collection Logo
    • 1000 Hi-Loft Pocket Coil with Foam Encased Perimeter
    • Cool Gel infused memory foam
    • Bio-Foam natural foam content reduces your carbon footprint
    • 10 Year Warranty
    • Made In Toronto, Canada
    Single/Twin In stock for fast delivery $411
    Twin XL $455
    Double/Full In stock for fast delivery $462
    Queen In stock for fast delivery $498
    Compare at $999
    King In stock for fast delivery $698
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  • Springwall 6-inch medium-firm tight-top foam mattress with patterned white quilted cover and charcoal sides Springwall Foam Mattress Collection Logo
    • Bio Comfort Foam Core
    • Gel Quilt Foam
    • Stretch Knit
    • Reduced Motion Transfer
    • Made In Canada
    Single/Twin In stock for fast delivery $171
    Twin XL In stock for fast delivery $228
    Double/Full In stock for fast delivery $231
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    Queen In stock for fast delivery $271
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    King In stock for fast delivery $381
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  • Springwall Comfort Pockets 12-inch medium-firm euro-top mattress, white pebble-motif cover with grey woven sides Springwall Comfort Pockets Mattress Logo
    • 884 Full Perimeter Comfort Pockets® (Pocket Coils)
    • Bio Foam with Gel
    • HD Medium Bio Comfort Foam
    • Bio Comfort Quilted Stretch knit surface
    • Made In Canada
    Single/Twin In stock for fast delivery $323
    Twin XL In stock for fast delivery $419
    Double/Full In stock for fast delivery $426
    RV Short Queen In stock for fast delivery $550
    Queen In stock for fast delivery $509
    Compare at $1,099
    King In stock for fast delivery $648
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  • Sealy Posturepedic Plus 1000 Series 12.5-inch medium-firm euro-top mattress, white-blue tufted top, grey sides Sealy Posturepedic Plus Mattress Logo
    • CleanProtect™ Cover
    • SealyAir™ Fibres
    • CertiPUR-US™ SealyComfort™ Gel HD Foam
    • SealyResponse™ HD Pocket Coils
    • StableEdge™ HD
    • PROBACK® Quilt with Targeted GelBoost™ HD Memory Foam
    Single/Twin $641
    Twin XL $695
    Double/Full $740
    Queen $807
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  • Springwall HC flippable 12-inch medium-firm euro-top mattress, white aloe vera cover with grey damask quilted sides Springwall Healthcare Flippable Collection Logo
    • 884 Full Perimeter Comfort Pockets® (Pocket Coils)
    • Bio Foam with Gel
    • Cool Touch Stretch Knit Sleep Surface
    • Flippable Bio Comfort Quilted Stretch knit surface
    • Made In Canada
    Single/Twin In stock for fast delivery $403
    Twin XL In stock for fast delivery $546
    Double/Full In stock for fast delivery $554
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    King In stock for fast delivery $857
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  • Springwall 7-inch medium-firm tight-top foam mattress, white cover with grey cloud motifs and charcoal quilted sides Springwall Foam Mattress Collection Logo
    • Bio Comfort Foam Core
    • Gel Quilt Foam
    • Convoluted Bio Comfort Foam
    • Reduced Motion Transfer
    • Made In Canada
    Single/Twin In stock for fast delivery $206
    Twin XL In stock for fast delivery $283
    Double/Full In stock for fast delivery $287
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    Queen In stock for fast delivery $335
    Compare at $799
    King In stock for fast delivery $476
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  • Stearns & Foster Estate 15-inch medium-firm pillow-top mattress, stacked blue top, navy herringbone sides Stearns & Foster Luxury Mattress Logo
    • Indulge Quilt With Silk & Wool Fibres
    • PrecisionMatch™ Memory Foam
    • PrimaSense™ Gel Infused Comfort Layers
    • Intellicoil® Innerspring (Pocket Coil)
    • Handmade By Certified Master Craftsman
    Twin XL In stock for fast delivery $1,899
    Double/Full In stock for fast delivery $1,999
    Queen $2,099
    Compare at $3,099
    King $2,699
    Online availability icon In-Stock Only 2 left!
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  • Evergreen 100% organic 10-inch medium-firm latex mattress, white diamond-quilted top, brown base trim Evergreen Sleep Pure 100% Organic Latex Mattress Collection Logo
    • 100% Certified Natural Organic Latex
    • Global Organic Latex Standard – Certified 100% Natural
    • Eco-Institute – No Fillers or Hazardous Particles
    • Oeko-Tex Standard 100 – No Harmful Substances
    • ABC Research Laboratories – Certified Antimicrobial
    Single/Twin In stock for fast delivery $1,246
    Twin XL $1,877
    Double/Full $1,906
    Queen $1,935
    Compare at $3,599
    King In stock for fast delivery $2,650
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How to Choose a Marshall Mattress

A Marshall mattress is a pocket coil bed, so the pocket coil is the part worth understanding before you start comparing feels. Each spring of heat-tempered drawn spring steel sits in its own fabric pocket, so it compresses only under the weight directly above it. The surface then follows the shape of your body, deeper beneath the hip and shoulder and shallower beneath the waist, rather than forming one broad hammock the way a connected coil unit can. Two things follow. Support is local, so the spine holds a straighter line, and movement is local, so a partner turning over does not travel across the bed.

Firmness on a pocket coil bed comes from two places: the spring unit itself, and the comfort layers above it. That is why a plush model and a firm one can share a support core and still feel nothing alike. Match the comfort layer to your position first. Side sleepers need enough give at the shoulder and hip to keep the spine level, usually medium or plush; back sleepers and stomach sleepers need the pelvis held near the surface, usually firm. Then account for weight, since a heavier sleeper compresses foam and springs further and often needs a step firmer than the label suggests. Kiln-dried wood belongs to the foundation side of the equation: lower moisture content means a frame that stays dimensionally stable under load.

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Pocket Coil Support

Individually wrapped steel springs respond only where weight is applied, so the surface contours to your body instead of flattening it. See more pocket coil mattresses.

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Motion Isolation

Because the springs are not wired together, movement stays where it happens. That makes pocket coil a first choice for couples and for anyone woken by a partner turning over.

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Kiln-Dried Wood

Kiln drying lowers the moisture content of the lumber, so the wood stays stable and resists warping under years of load, which matters in the frame that carries the spring unit.

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Plush, Medium or Firm

One support core can wear very different comfort layers, so ask about feel and construction separately. Plush, medium and firm are choices to fit a body, not quality grades.

Frequently Asked Questions About Marshall Mattresses

What is a pocket coil mattress?
A pocket coil mattress carries its support in individual steel springs, each sewn into its own fabric pocket. Because the springs are not linked to one another, one can compress while its neighbour stays put, so the surface contours to your body point by point. The two practical benefits are closer support along the spine and far less motion transfer than a bed built on one connected spring unit.
Is a pocket coil better than a connected coil mattress?
On contouring and motion isolation, yes for most sleepers. A connected coil unit moves as a sheet, so weight in one spot lifts or drops the area around it and a partner's movement travels. Pocket coils act independently. Connected coil beds are simpler and tend to feel firmer, so they still suit shoppers who want a flat, very supportive surface. Compare the two constructions directly.
Does coil count matter in a pocket coil mattress?
Less than most shoppers expect. Past a reasonable threshold, adding more springs of the same gauge changes the feel very little, and figures are not comparable between makers because coil diameter, wire gauge and the number of turns all differ. Wire gauge and the quality of the tempering matter more, as does what sits above the springs.
What firmness should I choose for my sleeping position?
Side sleepers usually want medium or plush, because the shoulder and hip have to sink far enough for the spine to stay level. Back sleepers usually want firm to medium, holding the pelvis near the surface so the lumbar curve stays supported. Stomach sleepers usually want firm, since any sag through the middle extends the lower back. Heavier sleepers should try a step firmer than the guideline.
What should I compare when shopping for a pocket coil mattress?
Four things: the spring unit, including wire gauge, tempering and whether the perimeter is reinforced for edge support; the comfort layers above it; the cover and quilting; and how the whole thing feels after a full ten minutes lying in your usual position. Bring your own pillow if you can. Firmness labels are a starting point, not a standard, and they differ between makers.
How long should a pocket coil mattress last, and how do I care for it?
Plan to reassess a quality mattress somewhere around the eight to ten year mark. The springs usually outlast the comfort layers, so what you notice first is softening on top rather than lost support underneath. Rotate the mattress head to foot two or three times a year, use a mattress protector, and give it a sound base, because a sagging foundation ages a good spring unit quickly.

Want Help Comparing Pocket Coil Feels?

Our non-commissioned sleep experts can walk you through firmness, comfort layers and what a pocket coil actually does under your body.

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