Firm Serta® Classic® A Firmness Level For Every Sleeper

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.
Serta Classic mattresses provide dependable comfort and support with a classic innerspring design enhanced by targeted lumbar support and cooling foam, delivering great value for Canadian sleepers.

Shop mattresses by comfort—Plush, Medium, Firm, and Extra‑Firm—to quickly find the feel that matches your sleep position.

Firm Serta® Classic® Firmness
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  • SERTA® Classic® 10" Firm Tight Top Mattress
    SERTA® Classic® 10" Firm Tight Top Mattress SERTA® Classic® 10" Firm Tight Top Mattress brand icon
    FIRM
    • 800 Edition Custom Support Coil System
    • 3 Zone Body Support
    • Serta® Support Foam
    • Serta® Anti-Microbial Fibre Technology
    • Serta® Best Edge® Foam Encasement
    • Designed and Made in Canada
    Single/Twin SOLD OUT
    Twin XL $510
    Double/Full SOLD OUT
    Queen SOLD OUT
    Compare at $1,199
    King SOLD OUT
    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 4
    Pickup available icon Only Pickup available to
    View Details
  • SERTA® Classic® 10" Firm Tight Top Mattress - Twin XL
    SERTA® Classic® 10" Firm Tight Top Mattress - Twin XL SERTA® Classic® 10" Firm Tight Top Mattress - Twin XL brand icon
    FIRM
    • 800 Edition Custom Support Coil System
    • 3 Zone Body Support
    • Serta® Support Foam
    • Serta® Anti-Microbial Fibre Technology
    • Serta® Best Edge® Foam Encasement
    • Designed and Made in Canada
    Twin XL $510
    Compare at $1,099
    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 4
    Pickup available icon Only Pickup available to
    View Details

2 Items

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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