Firm Premium Adjustable Base Compatible Grey All Mattresses

Firm mattresses give you a solid, supportive surface with minimal sink — keeping your spine aligned and making it easier to move and get in and out of bed. They're the top choice for back and stomach sleepers, heavier bodies, and anyone who finds softer beds uncomfortable. Compare every firm option below by brand, profile, and price.
Premium mattresses step up the materials, support systems, and comfort layers for a noticeably more refined sleep — without the top-tier price. They suit shoppers who want lasting quality and a more luxurious feel for their primary bedroom. Compare every premium option below by brand, type, and feel.
These mattresses are built to flex with adjustable bed bases — bending smoothly at the head and foot without damage — so you can raise, recline, and find your ideal position. Compare every adjustable-base-compatible option below by brand, type, and feel.

Shop 200+ mattresses from Serta, Beautyrest, Sealy, Tempur-Pedic, Springwall, and Stearns & Foster at National Mattress — available in Single/Twin through King sizes from $99 to $6,640. Choose from innerspring, euro-top, memory foam, hybrid, and latex constructions in four firmness levels from extra firm to plush. Every mattress is manufactured in Canadian factories using CertiPUR-US® certified foams and ships free across Canada with a 365-night sleep trial, price match guarantee, and manufacturer warranty coverage up to 25 years.

Firm Premium Adjustable Base Compatible Grey All Mattresses
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  • SEALY® Posturepedic® 800 Series 11.5" Firm Tight Top Mattress SEALY® Posturepedic® 800 Series 11.5" Firm Tight Top Mattress brand icon
    • 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 $420
    Twin XL In stock for fast delivery $474
    Double/Full $486
    Queen In stock for fast delivery $544
    Compare at $1,099
    King $793
    Online availability icon In-Stock Only 6 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery as soon as Tomorrow, Jun 6
    Pickup available icon Only Pickup available to
  • SEALY® Posturepedic® Plus 1000 Series 11.5" Firm Tight Top Mattress SEALY® Posturepedic® Plus 1000 Series 11.5" Firm Tight Top Mattress brand icon
    • 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 $554
    Twin XL In stock for fast delivery $619
    Double/Full $642
    Queen In stock for fast delivery $690
    Compare at $1,399
    King $923
    Online availability icon In-Stock
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery as soon as Tomorrow, Jun 6
    Pickup available icon Only Pickup available to
  • BEAUTYREST® 12.5" Tight Top Firm Mattress BEAUTYREST® 12.5" Tight Top Firm Mattress brand icon
    • 875 Beautyrest® Pocketed Coil Technology
    • Beautyrest® ActiveResponse Memory Foam
    • Beautyrest® Firm Gel Support Foam
    • Beautyrest® Support Foam
    • Beautyrest® Antimicrobial Fibre Technology
    Single/Twin $643
    Twin XL In stock for fast delivery $688
    Double/Full In stock for fast delivery $699
    Queen $732
    Compare at $1,499
    King $900
    Online availability icon In-Stock Only 6 left!
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    Free delivery availability icon Free delivery as soon as Tomorrow, Jun 6
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  • BEAUTYREST® 14" Pillow Top Firm Mattress BEAUTYREST® 14" Pillow Top Firm Mattress brand icon
    • 875 Beautyrest® Pocketed Coil Technology
    • Beautyrest® ActiveResponse Memory Foam
    • Beautyrest® Medium Gel Foam
    • Beautyrest® Support Foam
    • Beautyrest® Antimicrobial Fibre Technology
    Single/Twin $706
    Twin XL In stock for fast delivery $740
    Double/Full $740
    Queen $805
    Compare at $1,699
    King $974
    Online availability icon In-Stock Only 6 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery as soon as Tomorrow, Jun 6
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  • BEAUTYREST® 15" Pillow Top Firm Mattress BEAUTYREST® 15" Pillow Top Firm Mattress brand icon
    • 875 Beautyrest® Pocketed Coil Technology
    • Beautyrest® ActiveResponse Memory Foam
    • SurfaceTouch™ Gel Memory Foam
    • Beautyrest® Medium+Firm Gel Foam
    • InfiniCool™ Technology
    • Beautyrest® Antimicrobial Fibre Technology
    Twin XL In stock for fast delivery $740
    Double/Full $740
    Queen In stock for fast delivery $750
    Compare at $2,499
    Single/Twin In stock for fast delivery $847
    King $980
    Online availability icon In-Stock Only 5 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery as soon as Tomorrow, Jun 6
    Pickup available icon Only Pickup available to
  • SEALY® Posturepedic® Natural Origins 13.5" Firm Tight Top Latex Mattress SEALY® Posturepedic® Natural Origins 13.5" Firm Tight Top Latex Mattress brand icon
    • OEKO-TEX Certified BioGel Latex
    • SealyCool Fibres with Silk & Wool
    • Organic Cotton Infused with Bamboo
    • Targeted ComfortSense Memory Foam
    • SealySupport HD Core
    • CertiPUR-US® Approved Foam
    Single/Twin In stock for fast delivery $831
    Twin XL In stock for fast delivery $864
    Double/Full In stock for fast delivery $878
    Queen In stock for fast delivery $923
    Compare at $1,899
    King $1,235
    Online availability icon In-Stock
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    Free delivery availability icon Free delivery as soon as Tomorrow, Jun 6
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  • BEAUTYREST® World Class™ 12.5" Hybrid Firm Mattress BEAUTYREST® World Class™ 12.5" Hybrid Firm Mattress brand icon
    • 1000 Beautyrest® Pocketed Coil Technology
    • Beautyrest® ActiveResponse Memory Foam
    • Beautyrest® Firm Gel Foam
    • World Class Relief™ HD Foam
    • InfiniCool™ Technology
    Twin XL In stock for fast delivery $1,039
    Double/Full In stock for fast delivery $1,055
    Queen $1,100
    Compare at $2,899
    King $1,266
    Online availability icon In-Stock Only 4 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery as soon as Tomorrow, Jun 6
    Pickup available icon Only Pickup available to
  • BEAUTYREST® World Class™ 13" Tight Top Firm Mattress BEAUTYREST® World Class™ 13" Tight Top Firm Mattress brand icon
    • 1000 Beautyrest® Pocketed Coil Technology
    • Beautyrest® ActiveResponse Memory Foam
    • SurfaceTouch™ Gel Memory Foam
    • World Class Relief™ HD Foam
    • InfiniCool™ MAX Technology
    • Beautyrest® Natural Lux Fibre Technology
    Single/Twin In stock for fast delivery $1,051
    Twin XL In stock for fast delivery $1,103
    Double/Full $1,120
    Queen In stock for fast delivery $1,174
    Compare at $2,999
    King $1,341
    Online availability icon In-Stock Only 8 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery as soon as Tomorrow, Jun 6
    Pickup available icon Only Pickup available to
  • BEAUTYREST® World Class™ 14.5" Tight Top Firm Mattress BEAUTYREST® World Class™ 14.5" Tight Top Firm Mattress brand icon
    • 1000 Beautyrest® Pocketed Coil Technology
    • 2X Beautyrest® ActiveResponse Memory Foam
    • SurfaceTouch™ Gel Memory Foam
    • World Class Relief™ HD Foam
    • InfiniCool™ MAX Technology
    • Beautyrest® Natural Lux Fibre Technology
    Single/Twin In stock for fast delivery $1,121
    Twin XL In stock for fast delivery $1,175
    Double/Full In stock for fast delivery $1,193
    Queen $1,248
    Compare at $3,199
    King $1,416
    Online availability icon In-Stock Only 6 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery as soon as Tomorrow, Jun 6
    Pickup available icon Only Pickup available to
  • SEALY® Posturepedic® 800 Series 11.5" Firm Tight Top Mattress - Single/Twin SEALY® Posturepedic® 800 Series 11.5" Firm Tight Top Mattress - Single/Twin brand icon
    • 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 $420
    Compare at $899
    Online availability icon Backorder Available
    In-Store availability icon On Display:
    Estimated delivery icon Estimated free delivery on Tuesday, Jun 23
  • SEALY® Posturepedic® 800 Series 11.5" Firm Tight Top Mattress - Twin XL SEALY® Posturepedic® 800 Series 11.5" Firm Tight Top Mattress - Twin XL brand icon
    • 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
    Twin XL In stock for fast delivery $474
    Compare at $999
    Online availability icon In-Stock Only 1 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery as soon as Tomorrow, Jun 6
    Pickup available icon Only Pickup available to
  • SEALY® Posturepedic® 800 Series 11.5" Firm Tight Top Mattress - Double/Full SEALY® Posturepedic® 800 Series 11.5" Firm Tight Top Mattress - Double/Full brand icon
    • 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
    Double/Full $486
    Compare at $999
    Online availability icon Backorder Available
    In-Store availability icon On Display:
    Estimated delivery icon Estimated free delivery on Tuesday, Jun 23

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