SealySupport™ Foundations & Boxsprings Mattresses for Standard Bed Frames Mattress Accessories

SealySupport™ foundations give your Sealy or compatible mattress a stable, supportive base built from a solid wood frame with a semi-flex metal wire grid. The right foundation protects your mattress and helps it perform and last longer. Made in Canada and backed by a 10-year warranty with free next-day delivery in Toronto.
These mattresses are built for a standard bed frame, box spring or platform bed rather than an adjustable base — solid, no-flex support for a classic setup. Shopping by feel or build instead? Browse by comfort (plush, medium, firm) or by type (memory foam, hybrid, pocket coil, traditional). Using an adjustable base? See our adjustable-bed-compatible mattresses. Every order includes a 365-night sleep trial and free delivery across Canada.

Complete your sleep setup with pillows, toppers, protectors, and more. These mattress accessories enhance comfort and extend mattress life.

SealySupport™ Foundations & Boxsprings Mattresses for Standard Bed Frames Accessories
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  • SEALY® Boxspring - High Profile 9"
    FLASH SALE TOP RATED LIMITED STOCK
    Sealy high-profile 9-inch boxspring foundation, grey fabric top with navy sides and metal corner guards SEALY® Boxspring - High Profile 9" brand icon
    • 9" Pedestal Foundation
    • Quilted Border
    • Corner Guards
    • Dark Fabric
    • Works with all Sealy Mattresses
    Single/Twin SOLD OUT
    Twin XL In stock for fast delivery $179
    Double/Full SOLD OUT
    Queen SOLD OUT
    Compare at $399
    King $358
    Queen Split $302
    Online availability icon In-Stock Only 1 left!
    In-Store availability icon On Display:
    Delivery availability icon Delivery to M5H 2N1 as soon as Tomorrow, Aug 20
    Pickup available icon Only Pickup available to
    M5H 2N1
    View Details
  • SEALY® Boxspring - Low Profile 5"
    FLASH SALE LIMITED STOCK
    Sealy low-profile 5-inch boxspring foundation, grey fabric top with navy sides and metal corner guards SEALY® Boxspring - Low Profile 5" brand icon
    • 5" Low Profile Foundation
    • Quilted Border
    • Corner Guards
    • Dark Fabric
    • Works with all Sealy Mattresses
    Single/Twin In stock for fast delivery $150
    Twin XL SOLD OUT
    Double/Full In stock for fast delivery $170
    Queen SOLD OUT
    Compare at $399
    King SOLD OUT
    Queen Split $302
    Online availability icon In-Stock Only 3 left!
    In-Store availability icon On Display:
    Delivery availability icon Delivery to M5H 2N1 as soon as Tomorrow, Aug 20
    Pickup available icon Only Pickup available to
    M5H 2N1
    View Details

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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.
  • Sleep Trials & Warranties: Enjoy peace of mind with flexible trials and warranties.
  • 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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