Medium Premium Side Sleeper Adjustable Base Compatible Grey 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.
Premium mattresses step up the materials, support systems, and comfort layers for a noticeably more refined sleep — without the top-tier price. They suit shoppers who want lasting quality and a more luxurious feel for their primary bedroom. Compare every premium option below by brand, type, and feel.
Side sleepers need a mattress that cushions the shoulders and hips while keeping the spine aligned — usually a plush to medium feel with strong pressure relief and contouring. The options below help side sleepers avoid shoulder and hip pain. 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 Premium Side Sleeper Adjustable Base Compatible Grey All Mattresses
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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 $491
    Twin XL In stock for fast delivery $566
    Double/Full In stock for fast delivery $575
    Queen $642
    Compare at $1,499
    King $904
    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 9
    Pickup available icon Only Pickup available to
  • 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 $641
    Twin XL In stock for fast delivery $695
    Double/Full In stock for fast delivery $740
    Queen In stock for fast delivery $807
    Compare at $1,899
    King $1,117
    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 9
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  • BEAUTYREST® 14" Euro Top Medium-Firm Mattress BEAUTYREST® 14" Euro Top Medium-Firm Mattress brand icon
    • 875 Beautyrest® Pocketed Coil Technology
    • Beautyrest® ActiveResponse Memory Foam
    • Beautyrest® Plush Gel Foam
    • Beautyrest® Support Foam
    • Beautyrest® Antimicrobial Fibre Technology
    Single/Twin $769
    Twin XL In stock for fast delivery $817
    Double/Full $830
    Queen $879
    Compare at $2,099
    King $1,034
    Online availability icon In-Stock Only 5 left!
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  • BEAUTYREST® 13" Tight Top Medium-Firm Mattress BEAUTYREST® 13" Tight Top Medium-Firm Mattress brand icon
    • 875 Beautyrest® Pocketed Coil Technology
    • Beautyrest® ActiveResponse Memory Foam
    • SurfaceTouch™ Gel Memory Foam
    • Beautyrest® Plush Gel Foam
    • InfiniCool™ Technology
    • Beautyrest® Antimicrobial Fibre Technology
    Single/Twin In stock for fast delivery $769
    Twin XL In stock for fast delivery $817
    Double/Full $830
    Queen $879
    Compare at $2,099
    King $1,034
    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 9
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  • BEAUTYREST® World Class™ 12.5" Hybrid Medium-Firm Mattress BEAUTYREST® World Class™ 12.5" Hybrid Medium-Firm Mattress brand icon
    • 1000 Beautyrest® Pocketed Coil Technology
    • Beautyrest® ActiveResponse Memory Foam
    • Beautyrest® Medium Gel Foam
    • World Class Relief™ HD Foam
    • InfiniCool™ Technology
    Twin XL In stock for fast delivery $1,125
    Double/Full $1,142
    Queen $1,196
    Compare at $2,899
    King $1,363
    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 9
    Pickup available icon Only Pickup available to
  • BEAUTYREST® World Class™ 13" Tight Top Medium-Firm Mattress BEAUTYREST® World Class™ 13" Tight Top Medium-Firm Mattress brand icon
    • 1000 Beautyrest® Pocketed Coil Technology
    • Beautyrest® ActiveResponse Memory Foam
    • SurfaceTouch™ Gel Memory Foam
    • World Class Relief™ HD Foam
    • InfiniCool™ MAX Technology
    • Beautyrest® Natural Lux Fibre Technology
    Single/Twin In stock for fast delivery $1,142
    Twin XL In stock for fast delivery $1,196
    Double/Full $1,214
    Queen $1,270
    Compare at $2,999
    King $1,438
    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 9
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  • BEAUTYREST® World Class™ 15.5" Pillow Top Medium-Firm Mattress BEAUTYREST® World Class™ 15.5" Pillow Top Medium-Firm Mattress brand icon
    • 1000 Beautyrest® Pocketed Coil Technology
    • Beautyrest® ActiveResponse Memory Foam
    • SurfaceTouch™ Gel Memory Foam
    • World Class Relief™ HD Foam
    • InfiniCool™ MAX Technology
    • Beautyrest® Natural Lux Fibre Technology
    Single/Twin $1,220
    Twin XL In stock for fast delivery $1,268
    Double/Full $1,287
    Queen $1,351
    Compare at $3,199
    King $1,513
    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 9
    Pickup available icon Only Pickup available to
  • BEAUTYREST® World Class™ 13.5" Hybrid Medium-Firm Mattress BEAUTYREST® World Class™ 13.5" Hybrid Medium-Firm Mattress brand icon
    • 1000 Beautyrest® Pocketed Coil Technology
    • Beautyrest® ActiveResponse Memory Foam
    • Beautyrest® Firm Gel Foam
    • 2X World Class Relief™ HD Foam
    • InfiniCool™ Technology
    Twin XL In stock for fast delivery $1,275
    Double/Full $1,294
    Queen $1,351
    Compare at $3,199
    King $1,513
    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 9
    Pickup available icon Only Pickup available to
  • BEAUTYREST® World Class™ 16" Pillow Top Medium-Firm Mattress BEAUTYREST® World Class™ 16" Pillow Top Medium-Firm Mattress brand icon
    • 1000 Beautyrest® Pocketed Coil Technology
    • 2X Beautyrest® ActiveResponse Memory Foam
    • SurfaceTouch™ Gel Memory Foam
    • World Class Relief™ HD Foam
    • InfiniCool™ MAX Technology
    • Beautyrest® Natural Lux Fibre Technology
    Single/Twin In stock for fast delivery $1,368
    Twin XL In stock for fast delivery $1,425
    Double/Full $1,447
    Queen $1,505
    Compare at $3,599
    King $1,678
    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 9
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  • SEALY® Posturepedic® 800 Series 13" Medium Firm Euro Top Mattress - Single/Twin SEALY® Posturepedic® 800 Series 13" Medium Firm Euro Top Mattress - Single/Twin 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 $491
    Compare at $1,199
    Online availability icon Backorder Available
    In-Store availability icon On Display:
    Estimated delivery icon Estimated free delivery on Tuesday, Jun 23
  • SEALY® Posturepedic® 800 Series 13" Medium Firm Euro Top Mattress - Twin XL SEALY® Posturepedic® 800 Series 13" Medium Firm Euro Top Mattress - Twin XL 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
    Twin XL In stock for fast delivery $566
    Compare at $1,399
    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 9
    Pickup available icon Only Pickup available to
  • SEALY® Posturepedic® 800 Series 13" Medium Firm Euro Top Mattress - Double/Full SEALY® Posturepedic® 800 Series 13" Medium Firm Euro Top Mattress - Double/Full 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
    Double/Full In stock for fast delivery $575
    Compare at $1,399
    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 9
    Pickup available icon Only Pickup available to

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