Medium Best In Class Mattresses Compatible with Adjustable Bed Base | Flex‑Friendly Foam, Latex & Hybrid Serta Mattresses

Medium mattresses balance cushioning and support — soft enough to relieve pressure, firm enough to keep your spine aligned. This medium-firm feel is the most universally comfortable choice, suiting combination sleepers, couples with different preferences, and most back and side sleepers. Compare every medium option below by brand and profile.
Best-in-class mattresses are our top performers — the highest-rated, best-reviewed models for comfort, support, and durability. Compare every best-in-class 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.

Serta is a globally recognized mattress brand celebrated for its comfort-first designs and sleep innovations. With over 90 years of experience, Serta continues to deliver quality mattresses that Canadians can trust.

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.

Medium Best In Class Mattresses Compatible with Adjustable Bed Base | Flex‑Friendly Foam, Latex & Hybrid Serta
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  • SERTA® Modern Series™ 8" Medium Firm Gel Foam Mattress SERTA® Modern Series™ 8" Medium Firm Gel Foam Mattress brand icon
    • 8 Inch Model with Double Layers of Comfort
    • Serta CoolWick Breathable Cover
    • PureComfort Gel Foam with PureComfort Foam Support Core
    • Designed and Built in Canada
    Single/Twin $431
    Twin XL In stock for fast delivery $445
    Double/Full $488
    Queen In stock for fast delivery $535
    Compare at $1,299
    King In stock for fast delivery $653
    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 11
    Pickup available icon Only Pickup available to
  • SERTA® Classic® 12.5" Medium Euro Top Mattress SERTA® Classic® 12.5" Medium Euro Top Mattress brand icon
    • 800 Edition Custom Support Coil System
    • 3 Zone Body Support + Serta® Support Gel Foam
    • Cool Twist® Gel Memory Foam + Serta® PillowSoft® Foam
    • Serta® Anti-Microbial Fibre Technology
    • Serta® Best Edge® Foam Encasement
    • Designed and Made in Canada
    Single/Twin $657
    Twin XL In stock for fast delivery $703
    Double/Full $713
    Queen In stock for fast delivery $754
    Compare at $1,799
    King $922
    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 11
    Pickup available icon Only Pickup available to
  • SERTA® Modern Series™ 8" Medium Firm Gel Foam Mattress - Single/Twin SERTA® Modern Series™ 8" Medium Firm Gel Foam Mattress - Single/Twin brand icon
    • 8 Inch Model with Double Layers of Comfort
    • Serta CoolWick Breathable Cover
    • PureComfort Gel Foam with PureComfort Foam Support Core
    • Designed and Built in Canada
    Single/Twin $431
    Compare at $1,099
    Online availability icon Backorder Available
    In-Store availability icon On Display:
    Estimated delivery icon Estimated free delivery on Tuesday, Jun 30
  • SERTA® Modern Series™ 8" Medium Firm Gel Foam Mattress - Twin XL SERTA® Modern Series™ 8" Medium Firm Gel Foam Mattress - Twin XL brand icon
    • 8 Inch Model with Double Layers of Comfort
    • Serta CoolWick Breathable Cover
    • PureComfort Gel Foam with PureComfort Foam Support Core
    • Designed and Built in Canada
    Twin XL In stock for fast delivery $445
    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 11
    Pickup available icon Only Pickup available to
  • SERTA® Modern Series™ 8" Medium Firm Gel Foam Mattress - Double/Full SERTA® Modern Series™ 8" Medium Firm Gel Foam Mattress - Double/Full brand icon
    • 8 Inch Model with Double Layers of Comfort
    • Serta CoolWick Breathable Cover
    • PureComfort Gel Foam with PureComfort Foam Support Core
    • Designed and Built in Canada
    Double/Full $488
    Compare at $1,199
    Online availability icon Backorder Available
    In-Store availability icon On Display:
    Estimated delivery icon Estimated free delivery on Tuesday, Jun 30
  • SERTA® Modern Series™ 8" Medium Firm Gel Foam Mattress - Queen SERTA® Modern Series™ 8" Medium Firm Gel Foam Mattress - Queen brand icon
    • 8 Inch Model with Double Layers of Comfort
    • Serta CoolWick Breathable Cover
    • PureComfort Gel Foam with PureComfort Foam Support Core
    • Designed and Built in Canada
    Queen In stock for fast delivery $535
    Compare at $1,299
    Online availability icon In-Stock Only 3 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery as soon as Tomorrow, Jun 11
    Pickup available icon Only Pickup available to
  • SERTA® Modern Series™ 8" Medium Firm Gel Foam Mattress - King SERTA® Modern Series™ 8" Medium Firm Gel Foam Mattress - King brand icon
    • 8 Inch Model with Double Layers of Comfort
    • Serta CoolWick Breathable Cover
    • PureComfort Gel Foam with PureComfort Foam Support Core
    • Designed and Built in Canada
    King In stock for fast delivery $653
    Compare at $1,499
    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 11
    Pickup available icon Only Pickup available to
  • SERTA® Classic® 12.5" Medium Euro Top Mattress - Single/Twin SERTA® Classic® 12.5" Medium Euro Top Mattress - Single/Twin brand icon
    • 800 Edition Custom Support Coil System
    • 3 Zone Body Support + Serta® Support Gel Foam
    • Cool Twist® Gel Memory Foam + Serta® PillowSoft® Foam
    • Serta® Anti-Microbial Fibre Technology
    • Serta® Best Edge® Foam Encasement
    • Designed and Made in Canada
    Single/Twin $657
    Compare at $1,599
    Online availability icon Backorder Available
    In-Store availability icon On Display:
    Estimated delivery icon Estimated free delivery on Tuesday, Jun 30
  • SERTA® Classic® 12.5" Medium Euro Top Mattress - Twin XL SERTA® Classic® 12.5" Medium Euro Top Mattress - Twin XL brand icon
    • 800 Edition Custom Support Coil System
    • 3 Zone Body Support + Serta® Support Gel Foam
    • Cool Twist® Gel Memory Foam + Serta® PillowSoft® Foam
    • Serta® Anti-Microbial Fibre Technology
    • Serta® Best Edge® Foam Encasement
    • Designed and Made in Canada
    Twin XL In stock for fast delivery $703
    Compare at $1,699
    Online availability icon In-Stock Only 3 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery as soon as Tomorrow, Jun 11
    Pickup available icon Only Pickup available to
  • SERTA® Classic® 12.5" Medium Euro Top Mattress - Double/Full SERTA® Classic® 12.5" Medium Euro Top Mattress - Double/Full brand icon
    • 800 Edition Custom Support Coil System
    • 3 Zone Body Support + Serta® Support Gel Foam
    • Cool Twist® Gel Memory Foam + Serta® PillowSoft® Foam
    • Serta® Anti-Microbial Fibre Technology
    • Serta® Best Edge® Foam Encasement
    • Designed and Made in Canada
    Double/Full $713
    Compare at $1,699
    Online availability icon Backorder Available
    In-Store availability icon On Display:
    Estimated delivery icon Estimated free delivery on Tuesday, Jun 30
  • SERTA® Classic® 12.5" Medium Euro Top Mattress - Queen SERTA® Classic® 12.5" Medium Euro Top Mattress - Queen brand icon
    • 800 Edition Custom Support Coil System
    • 3 Zone Body Support + Serta® Support Gel Foam
    • Cool Twist® Gel Memory Foam + Serta® PillowSoft® Foam
    • Serta® Anti-Microbial Fibre Technology
    • Serta® Best Edge® Foam Encasement
    • Designed and Made in Canada
    Queen In stock for fast delivery $754
    Compare at $1,799
    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 11
    Pickup available icon Only Pickup available to
  • SERTA® Classic® 12.5" Medium Euro Top Mattress - King
    BEST IN CLASS TOP RATED LIMITED STOCK
    SERTA® Classic® 12.5" Medium Euro Top Mattress - King SERTA® Classic® 12.5" Medium Euro Top Mattress - King brand icon
    • 800 Edition Custom Support Coil System
    • 3 Zone Body Support + Serta® Support Gel Foam
    • Cool Twist® Gel Memory Foam + Serta® PillowSoft® Foam
    • Serta® Anti-Microbial Fibre Technology
    • Serta® Best Edge® Foam Encasement
    • Designed and Made in Canada
    King $922
    Compare at $2,199
    Online availability icon Backorder Available
    In-Store availability icon On Display:
    Estimated delivery icon Estimated free delivery on Tuesday, Jun 30

12 Items

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