Firm Memory Foam Adjustable Base Compatible Sealy 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.
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.
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.

Sealy is a pioneering mattress brand known for its science-backed support and comfort. It was voted the #1 most trusted mattress brand in Canada, reflecting over a century of quality craftsmanship.

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 Memory Foam Adjustable Base Compatible Sealy
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  • SEALY® Cocoon™ 10" Firm Memory Foam Mattress SEALY® Cocoon™ 10" Firm Memory Foam Mattress brand icon
    • Premium Fabric Cover
    • Perfect Fit Memory Foam
    • Personalized Comfort Layer
    • Essential Support Foam
    • 10 Year Warranty
    Twin XL $735
    Double/Full In stock for fast delivery $765
    Queen In stock for fast delivery $829
    Compare at $2,199
    King In stock for fast delivery $1,027
    Online availability icon In-Stock Only 7 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery as soon as Tomorrow, Jun 7
    Pickup available icon Only Pickup available to
  • SEALY® Posturepedic Luxury® 14.5" Firm Hybrid Mattress SEALY® Posturepedic Luxury® 14.5" Firm Hybrid Mattress brand icon
    • 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
    Twin XL In stock for fast delivery $1,473
    Double/Full In stock for fast delivery $1,503
    Queen In stock for fast delivery $1,583
    Compare at $3,999
    King $1,859
    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 7
    Pickup available icon Only Pickup available to
  • SEALY® Cocoon™ 10" Firm Memory Foam Mattress - Twin XL SEALY® Cocoon™ 10" Firm Memory Foam Mattress - Twin XL brand icon
    • Premium Fabric Cover
    • Perfect Fit Memory Foam
    • Personalized Comfort Layer
    • Essential Support Foam
    • 10 Year Warranty
    Twin XL $735
    Compare at $1,899
    Online availability icon Backorder Available
    In-Store availability icon On Display:
    Estimated delivery icon Estimated free delivery on Tuesday, Jun 23
  • SEALY® Cocoon™ 10" Firm Memory Foam Mattress - Double/Full SEALY® Cocoon™ 10" Firm Memory Foam Mattress - Double/Full brand icon
    • Premium Fabric Cover
    • Perfect Fit Memory Foam
    • Personalized Comfort Layer
    • Essential Support Foam
    • 10 Year Warranty
    Double/Full In stock for fast delivery $765
    Compare at $1,999
    Online availability icon In-Stock Only 2 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery as soon as Tomorrow, Jun 7
    Pickup available icon Only Pickup available to
  • SEALY® Cocoon™ 10" Firm Memory Foam Mattress - Queen SEALY® Cocoon™ 10" Firm Memory Foam Mattress - Queen brand icon
    • Premium Fabric Cover
    • Perfect Fit Memory Foam
    • Personalized Comfort Layer
    • Essential Support Foam
    • 10 Year Warranty
    Queen In stock for fast delivery $829
    Compare at $2,199
    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 7
    Pickup available icon Only Pickup available to
  • SEALY® Cocoon™ 10" Firm Memory Foam Mattress - King SEALY® Cocoon™ 10" Firm Memory Foam Mattress - King brand icon
    • Premium Fabric Cover
    • Perfect Fit Memory Foam
    • Personalized Comfort Layer
    • Essential Support Foam
    • 10 Year Warranty
    King In stock for fast delivery $1,027
    Compare at $2,999
    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 7
    Pickup available icon Only Pickup available to
  • SEALY® Posturepedic Luxury® 14.5" Firm Hybrid Mattress - Twin XL SEALY® Posturepedic Luxury® 14.5" Firm Hybrid Mattress - Twin XL brand icon
    • 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
    Twin XL In stock for fast delivery $1,473
    Compare at $3,899
    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 7
    Pickup available icon Only Pickup available to
  • SEALY® Posturepedic Luxury® 14.5" Firm Hybrid Mattress - Double/Full SEALY® Posturepedic Luxury® 14.5" Firm Hybrid Mattress - Double/Full brand icon
    • 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
    Double/Full In stock for fast delivery $1,503
    Compare at $3,899
    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 7
    Pickup available icon Only Pickup available to
  • SEALY® Posturepedic Luxury® 14.5" Firm Hybrid Mattress - Queen SEALY® Posturepedic Luxury® 14.5" Firm Hybrid Mattress - Queen brand icon
    • 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
    Queen In stock for fast delivery $1,583
    Compare at $3,999
    Online availability icon In-Stock Only 2 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery as soon as Tomorrow, Jun 7
    Pickup available icon Only Pickup available to
  • SEALY® Posturepedic Luxury® 14.5" Firm Hybrid Mattress - King SEALY® Posturepedic Luxury® 14.5" Firm Hybrid Mattress - King brand icon
    • 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 $1,859
    Compare at $4,699
    Online availability icon Backorder Available
    In-Store availability icon On Display:
    Estimated delivery icon Estimated free delivery on Tuesday, Jun 23
  • OPEN BAG - SEALY® Cocoon™ 10" Firm Memory Foam Mattress - King OPEN BAG - SEALY® Cocoon™ 10" Firm Memory Foam Mattress - King brand icon
    • Premium Fabric Cover
    • Perfect Fit Memory Foam
    • Personalized Comfort Layer
    • Essential Support Foam
    • 10 Year Warranty
    King In stock for fast delivery $699
    Compare at $2,999
    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 7
    Pickup available icon Only Pickup available to

11 Items

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