Medium Sealy Back Sleeper Adjustable Base Compatible All 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.
Sealy mattresses are engineered for dependable, body-aligning support — many featuring Posturepedic Technology that reinforces the centre third where you need it most. Compare every option below by feel, size, and price.
Back sleepers do best on a mattress that supports the lower back while gently following the spine's natural curve — typically a medium to medium-firm feel. The options below balance support and pressure relief for back sleepers. Compare them 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.

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 Sealy Back Sleeper Adjustable Base Compatible All Mattresses
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  • SEALY® Essentials 8" Medium Firm Tight Top Foam Mattress SEALY® Essentials 8" Medium Firm Tight Top Foam Mattress brand icon
    • CleanProtect™ Fabric
    • SealyLoft™ Quilt with Moisture Wicking Fibres
    • CertiPUR-US™ SealySupport™ HD Foam
    • CertiPUR-US™ SealySupport™ HD Core
    • SealySupport™ HD Foam
    Single/Twin $199
    Double/Full $249
    Queen $299
    Compare at $999
    Twin XL In stock for fast delivery $355
    King $551
    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® Essentials 11" Medium Firm Tight Top Mattress SEALY® Essentials 11" Medium Firm Tight Top Mattress brand icon
    • CleanProtect™ Fabric
    • SealyLoft™ Quilt with Moisture Wicking Fibres
    • CertiPUR-US™ SealySupport™ HD Foam
    • Posture Touch® Pocket Coils
    • EssentialEdge™ Coil Support
    Single/Twin $382
    Twin XL In stock for fast delivery $395
    Double/Full $431
    Queen In stock for fast delivery $475
    Compare at $1,199
    King $630
    Online availability icon In-Stock Only 5 left!
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    Free delivery availability icon Free delivery as soon as Tomorrow, Jun 6
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  • SEALY® Essentials 10.5" Medium Firm Eurotop Foam Mattress SEALY® Essentials 10.5" Medium Firm Eurotop Foam Mattress brand icon
    • CleanProtect™ Fabric
    • SealyLoft™ Quilt with Moisture Wicking Fibres
    • CertiPUR-US™ SealySupport™ HD Foam
    • CertiPUR-US™ SealySupport™ HD Core
    • SealySupport™ HD Foam
    Single/Twin $403
    Twin XL In stock for fast delivery $446
    Double/Full $453
    Queen In stock for fast delivery $475
    Compare at $1,199
    King $612
    Online availability icon In-Stock Only 9 left!
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  • SEALY® Posturepedic® 800 Series 13" Medium Firm Euro Top Mattress SEALY® Posturepedic® 800 Series 13" Medium Firm Euro 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 $458
    Twin XL In stock for fast delivery $525
    Double/Full In stock for fast delivery $536
    Queen $595
    Compare at $1,499
    King $845
    Online availability icon In-Stock Only 6 left!
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  • SEALY® Cocoon™ 8" Medium Firm Memory Foam Mattress SEALY® Cocoon™ 8" Medium Firm Memory Foam Mattress brand icon
    • Premium Fabric Cover
    • Perfect Fit Memory Foam
    • Personalized Comfort Layer
    • Essential Support Foam
    • 10 Year Warranty
    Single/Twin $459
    Twin XL In stock for fast delivery $512
    Double/Full In stock for fast delivery $576
    Queen In stock for fast delivery $632
    Compare at $1,699
    King In stock for fast delivery $814
    Online availability icon In-Stock
    In-Store availability icon On Display:
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  • SEALY® Posturepedic Plus® 1000 Series 12.5" Medium Firm Euro Top Mattress SEALY® Posturepedic Plus® 1000 Series 12.5" Medium Firm Euro 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 $598
    Twin XL In stock for fast delivery $648
    Double/Full In stock for fast delivery $691
    Queen In stock for fast delivery $747
    Compare at $1,899
    King $1,043
    Online availability icon In-Stock
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery as soon as Tomorrow, Jun 6
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  • SEALY® Posturepedic Plus® 1200 Series 15.5" Medium Firm Europillowtop Mattress SEALY® Posturepedic Plus® 1200 Series 15.5" Medium Firm Europillowtop Mattress brand icon
    • CleanProtect™ Cover
    • Sealy AirSense™ Fibres Topped with SealyIce™ Yarn
    • CertiPUR-US™ SealyComfort™ Gel HD Foam
    • Posture Grid® Coil System featuring PostureSense™ Nano Coils
    • SolidEdge™ PRO
    • PROBACK® Plus Quilt with Targeted GelSense™ HD Memory Foam
    Single/Twin In stock for fast delivery $815
    Twin XL In stock for fast delivery $864
    Double/Full $922
    Queen $971
    Compare at $2,499
    King $1,195
    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 6
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  • SEALY® Posturepedic Luxury® 14.5" Medium Firm Hybrid Eurotop Mattress SEALY® Posturepedic Luxury® 14.5" Medium Firm Hybrid Eurotop Mattress brand icon
    • SealyMAX™ Core System featuring SealyResponse™ PRO & SolidSupport™ Pocket Coils
    • GelSense™ MAX Memory Foam
    • SealySupport™ Gel HD Foam
    • SupremeLoft™ Quilt featuring Silk & Wool
    • SealyCool™ Fabric
    • SolidEdge™ PRO Coil Edge
    Twin XL In stock for fast delivery $995
    Double/Full $1,011
    Queen $1,097
    Compare at $2,299
    King $1,280
    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
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  • SEALY® Posturepedic Luxury® 13.5" Medium Firm Hybrid Mattress SEALY® Posturepedic Luxury® 13.5" Medium 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 $1,312
    Double/Full $1,340
    Queen $1,415
    Compare at $3,599
    King $1,693
    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 6
    Pickup available icon Only Pickup available to
  • SEALY® Essentials 8" Medium Firm Tight Top Foam Mattress - Single/Twin SEALY® Essentials 8" Medium Firm Tight Top Foam Mattress - Single/Twin brand icon
    • CleanProtect™ Fabric
    • SealyLoft™ Quilt with Moisture Wicking Fibres
    • CertiPUR-US™ SealySupport™ HD Foam
    • CertiPUR-US™ SealySupport™ HD Core
    • SealySupport™ HD Foam
    Single/Twin $199
    Compare at $799
    Online availability icon Backorder Available
    In-Store availability icon On Display:
    Estimated delivery icon Estimated free delivery on Tuesday, Jun 23
  • SEALY® Essentials 8" Medium Firm Tight Top Foam Mattress - Double/Full SEALY® Essentials 8" Medium Firm Tight Top Foam Mattress - Double/Full brand icon
    • CleanProtect™ Fabric
    • SealyLoft™ Quilt with Moisture Wicking Fibres
    • CertiPUR-US™ SealySupport™ HD Foam
    • CertiPUR-US™ SealySupport™ HD Core
    • SealySupport™ HD Foam
    Double/Full $249
    Compare at $999
    Online availability icon Backorder Available
    In-Store availability icon On Display:
    Estimated delivery icon Estimated free delivery on Tuesday, Jun 23
  • SEALY® Essentials 8" Medium Firm Tight Top Foam Mattress - Queen SEALY® Essentials 8" Medium Firm Tight Top Foam Mattress - Queen brand icon
    • CleanProtect™ Fabric
    • SealyLoft™ Quilt with Moisture Wicking Fibres
    • CertiPUR-US™ SealySupport™ HD Foam
    • CertiPUR-US™ SealySupport™ HD Core
    • SealySupport™ HD Foam
    Queen $299
    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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