SEALY® Boxspring - High Profile 9" - King Split

SEALY® Boxspring - High Profile 9" - King Split -

$358.00 $799.00

SEALY® Boxspring - High Profile 9" - King Split

Firmness
Style High Profile
Height 9.0"
Sleep Position

Top Features

Quilt
Non-quilted Stretch Knit Non-Slip Fabric
Condition
Brand new, manufacturer sealed.
Warranty
10 Year Warranty
Read Full Product Description and Specifications

About this Brand

Sealy LogoSealy Logo

Sealy® mattresses provide reliable comfort and support at a budget-friendly price. This collection offers the perfect balance of innerspring support and cooling foam comfort, delivering Sealy quality to Canadians at great value.

SKU: SEALY-BOXSPRING-KINGSPLIT-HIGH

TOP RATED iconTOP RATED LIMITED STOCK iconLIMITED STOCK
Our Price
$358.00
Retail Price
$799.00

Availability

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Estimated Delivery Date: Unavailable Free delivery as soon as Delivery as soon as Free next-day delivery is available for in-stock items in eligible postal codes. Prefer a different day? Pick any available date during checkout. Next-day delivery is available for in-stock items in eligible postal codes. Prefer a different day? Pick any available date during checkout.
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Deluxe White Glove icon Deluxe White Glove for Includes delivery to your room of choice, professional unboxing and assembly by a specialized team, and complete cleanup with packaging removal, and removal of old mattress to the curb if required.
Only Pickup available icon Free pickup from your nearest location
Ground-Level Delivery to Front Door/Lobby for Delivery to the first door of the address or the lobby of an apartment or condo.
Inside Room Of Choice for Delivery inside the room of your choice.
Deluxe White Glove for Includes delivery to your room of choice, professional unboxing and assembly by a specialized team, and complete cleanup with packaging removal, and removal of old mattress to the curb if required.

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Sealy King Split Boxspring - High Profile 9" | Elevate Your Sleep with Stylish Support!

Discover the perfect blend of sophistication and comfort with the Sealy King Split Boxspring, designed to enhance your sleep environment dramatically. Standing tall at 9 inches, this elegant box spring complements any Sealy king mattress, ensuring that your restful nights are both stylish and supportive. The refined quilted border wrapped in deep-toned fabric not only enhances your décor but also promises lasting durability and unwavering support for joyful slumbers.

Key Features

  • Luxurious Height: The elevated 9-inch profile simplifies getting in and out of bed while maximizing mattress performance, creating an effortlessly inviting sleep experience.
  • Chic Quilted Finish: Featuring a stylish quilted edge, this box spring accentuates your bedroom's elegance while providing an extra layer of plush comfort that invites relaxation.
  • Robust Corner Guards: Equipped with specially designed corner guards, this box spring enhances durability and safeguards against everyday wear, ensuring a long-lasting investment.
  • Subtle Dark Fabric: Crafted with modern dark fabric, this design complements various bedroom aesthetics while maintaining a clean look that enhances your sleeping area.

Benefits

  • Superior Construction: Built with solid wood and a semi-flex metal wire frame, this foundation is engineered for exceptional stability, contributing to an extended mattress lifespan.
  • Compatible Fit: This box spring is universally designed to work seamlessly with all King Size Sealy mattresses, allowing for customized sleep setups that prioritize both comfort and functionality.

Perfect For

Ideal for anyone seeking an enhancement to their sleep quality with added style, the Sealy King Split Boxspring seamlessly fits into any living space. From modern urban apartments to classic suburban homes, this foundation meets the needs of diverse lifestyles while delivering dependable support and a touch of sophistication.

Product Details

  • Dimensions: 76″ x 80″ (inches) – 193cm x 203cm (centimeters)
  • Profile Height: 9" (inches) - 22.8cm (centimeters)
  • Firmness: Moderately supportive, designed to enhance your mattress comfort.
  • Warranty: Comprehensive manufacturer's warranty included, providing assurance with your purchase.
  • Guarantees: Benefit from convenient next day delivery, a price match guarantee, and a secure 365 Night comfort trial for a worry-free shopping experience!

Transform your sleep experience with the Sealy King Split Boxspring - High Profile 9". Crafted for those who value both luxurious comfort and exceptional quality, this box spring serves not just as a support base, but as a statement piece in your bedroom sanctuary. Embrace tranquil sleep night after night with the trusted craftsmanship from Sealy!

Accessory Size King
Trending & Offers Top Rated, Limited Stock
Core Type Solid Wood with Semi-flex Metal Wire Frame
Core Density 22-31 lb/ft³
Core Material Spruce/Pine/Fir (SPF) with Steel Wire
Brands Sealy
Price Range Premium
Model King High Profile 9"
Condition Brand new, manufacturer sealed.
Warranty 10 Year Warranty
Cover Material Non-Skid Top. Fabric may vary.
Colour Black
Quilt Non-quilted Stretch Knit Non-Slip Fabric
Mattress Height in Inches 9.00 Inches
Additional Features Corner Guards
Certifications Sealy® foundations comes from suppliers certified by the Sustainable Forestry Initiative (SFI), Forest Stewardship Council (FSC), or Canadian Standards Association (CSA), ensuring responsible sourcing.
Compatible With Adjustable Beds No
Vented Yes
Removable Cover No
Assembly Required No
Care Instruction Spot clean only.
Country Of Origin Canada
Manufacturer Contact Information http://www.sealy.com/
Shipping Scheduled delivery with National Mattress. Please select your preferred delivery date in the checkout.
Custom Sizes Available No
Product Length (inches) 80.0 in
Product Width (inches) 76.0 in
Product Height (inches) 9.0 in
Product Length (cm) 203.2 cm
Product Width (cm) 193.0 cm
Product Height (cm) 22.9 cm
Product Weight (kg) 35.9 kg
Product Supplier Code ***TWINXL x 2***
Product Category Boxspring
Product Type Accessories - Boxspring
Product Sub Type High Profile

Serta Perfect Sleeper 10.5" Firm Tight Top Mattress Performance & Feel - Full Comfort Analysis

Overview: The Serta Perfect Sleeper 10.5" Firm Tight Top is a premium hybrid from Serta's Perfect Sleeper® collection (est. 1931), developed in partnership with the National Sleep Foundation to address common sleep problems including temperature regulation, partner disturbance, and tossing/turning. With a firm feel (8/10) and very minimal sinkage (1.58 inches), this mattress delivers exceptional cooling, outstanding edge support, and responsive bounce at an accessible premium price under $550 (Queen), ideal for back and stomach sleepers seeking a supportive, on-top sleeping surface.

Realistic Expectations
These scores reflect realistic expectations based on construction, materials, and verified owner feedback. Your results will vary by body type, base, and room temperature.

Quick Specs

SpecDetails
Mattress TypeHybrid (Tight Top with Pocket Coils)
Firmness8/10 (Firm)
Mattress Height10.5 in (26.67 cm)
Comfort Layer Thickness1 in (2.54 cm)
Queen Price$547
Fiberglass-FreeYes
Ships in a BoxNo
CertificationsCertiPUR-US® certified foams

Performance Scores - Comfort IQ™ Score

Comfort IQ™ Scores are derived from published specifications, materials, and construction details to help compare mattresses consistently.

↔ Scroll table for more details

Category Score
(0-10)
Key Inputs What it means for you
Overall Score 9.9 Type: Hybrid • Firmness: 8/10 • Price (Queen): $547 A near-perfect premium hybrid from Serta's Perfect Sleeper® collection delivering exceptional performance across virtually all categories at excellent value.
Cooling 10.0 Cover: CoolFeel Fabric™ + Fiber Layer • Cooling features: Gel-infused foams, coil airflow Exceptional cooling performance; the CoolFeel Fabric™, gel-infused foams, and open coil system keep this mattress sleeping cool for virtually all sleepers.
Sink-in Feel / Contour Not a score Sinkage: 1.58 in (4.01 cm) • Feel: Very Minimal (Light Contour) You will feel firmly supported on top of the mattress with only slight body contouring; this is a firm, on-top sleeping experience.
Motion Isolation 9.0 Type: Hybrid • Coil type: 825 Edition Custom Support Coil System • Comfort thickness: 1 in (2.54 cm) Excellent motion isolation; the comfort foams add a buffering layer that helps dampen vibration and cut down on cross-bed disturbance.
Responsiveness 10.0 Top feel: PillowSoft Foam + Serta Support Foam • Firmness: 8/10 Very responsive with a buoyant feel; the coil support core and firmer surface make rolling and changing positions exceptionally easy.
Bounce 10.0 Bounce feel: High The 825 Edition Custom Support Coil System provides excellent bounce and lift, making position changes feel effortless.
Edge Support 10.0 Edge feature: Reinforced perimeter • Coil gauge: 16/15.5/16 Exceptional edge stability; the reinforced perimeter provides consistent support when sitting or sleeping near the edge.
Pressure Relief 10.0 Comfort layers: PillowSoft Foam + Serta Support Foam + Gel Band Support • Zoning: Custom Support zoned coils Excellent pressure relief for a firm mattress; the zoned coils add targeted give at pressure points while maintaining support.
Off-Gassing 10.0 Estimated: 1 day • Certifications: CertiPUR-US® Expect low initial odour that typically dissipates within a day; CertiPUR-US certification ensures low VOC emissions.
Couples / Intimacy 9.7 Derived from Bounce + Edge + Motion Exceptional for couples with outstanding bounce, rock-solid edge support, and excellent motion isolation.

Best For

  • Back and stomach sleepers who need firm support (8/10) with a sleek tight-top design that maintains proper spinal alignment and prevents hip sinking, developed in partnership with the National Sleep Foundation.
  • Hot sleepers seeking exceptional cooling, as the CoolFeel Fabric™, gel-infused foams, and 825 Edition Custom Support Coil System achieve one of the coolest settling temperatures available at this price point.
  • Couples seeking a premium mattress with outstanding bounce (10.0), rock-solid edge support (10.0), and excellent motion isolation (9.0) at under $550 (Queen).

Considerations

  • Side sleepers who need deep pressure relief may find the firm tight-top design (1.58 inches sinkage) provides less cushioning than they prefer at the shoulders and hips; consider a Euro-top or plush option.
  • Those who prefer a plush, sinking-in feel should look elsewhere; this mattress keeps you firmly on top with minimal sinkage and light contouring.
  • Lighter sleepers (under 130 lb) may find this mattress feels quite firm, as the very minimal sinkage is designed for medium to heavier body types.

Feel & Firmness

At 8/10 on the firmness scale, the Serta Perfect Sleeper 10.5" Firm Tight Top delivers a true firm feel with a sleek, streamlined sleeping surface. With only 1.58 inches (4.01 cm) of sinkage, you will feel firmly positioned on top of the mattress with light body contouring rather than cradled into the surface. The tight-top design provides a modern, flat sleeping surface without the additional bulk of a pillow top or Euro top, while the gel-infused foams provide just enough cushioning at pressure points.

The responsiveness score of 10.0 reflects very buoyant feel with excellent lift from the coil support core. The 825 Edition Custom Support Coil System adds spring and lift, while the minimal sinkage keeps you more on top of the bed. The firmer surface helps you push off and reposition with ease, making this excellent for combination sleepers who favour back or stomach sleeping but occasionally shift positions throughout the night.

Cooling

This mattress earns a perfect 10.0 cooling score thanks to Serta's comprehensive cooling system developed in partnership with the National Sleep Foundation. The CoolFeel Fabric™ cover provides a cool-to-the-touch feel at contact, while the Fiber Layer enhances airflow. The gel-infused foams help draw heat away from the body, and the 825 Edition Custom Support Coil System creates open channels for continuous airflow throughout the mattress. In temperature observations, the mattress showed a baseline of 22.0°C (71.6°F), a maximum of 29.9°C (85.8°F), and settled at just 24.6°C (76.3°F). This is among the coolest-sleeping firm mattresses available at this price point.

Motion Isolation

Scoring an excellent 9.0 for motion isolation, this hybrid provides outstanding partner disturbance reduction. The comfort foams add a buffering layer that helps dampen vibration at the surface, while layering foams over the coil unit helps cut down on cross-bed vibration. The Perfect Sleeper® collection was specifically designed in partnership with the National Sleep Foundation to address partner disturbance. While the high bounce may cause slightly more motion transfer than all-foam designs, this is exceptional for a responsive hybrid at this price point.

Edge Support

With a perfect 10.0 edge support score, this mattress provides exceptional perimeter stability thanks to the reinforced edge design. The 825 Edition Custom Support Coil System with varying gauge wire (16/15.5/16) adds structural integrity that resists compression when sitting on the edge or sleeping near the side. Maximum edge sinkage was measured at only 2.90 inches (7.37 cm), which is excellent for a 10.5-inch tight-top mattress. Couples who need to use the full sleep surface will appreciate the consistent support from centre to edge.

Pressure Relief

The Serta Perfect Sleeper 10.5" Firm Tight Top earns a perfect 10.0 pressure relief score, which is exceptional for a firm tight-top mattress. The gel-infused cushioning foams create light contouring at the shoulders and hips, while the zoned 825 Edition Custom Support Coil System adds extra give at pressure points. The Gel Band Support provides targeted cushioning in the lumbar region. Despite the firm feel (8/10), the zoned design provides excellent pressure relief for back sleepers while stomach sleepers benefit from the firm support that prevents hip sinking.

Off-Gassing

As a premium hybrid with CertiPUR-US® certified foams, this mattress may have a low initial odour upon delivery that typically dissipates within 1 day based on reported experience. The combination of certified foams and the breathable coil system helps minimize and dissipate any new-mattress smell quickly.

For best results, allow the mattress to air out in a well-ventilated room for several hours after delivery. Washing your sheets before first use can also help ensure a fresh sleeping environment.

Construction & Materials

The Serta Perfect Sleeper 10.5" Firm Tight Top is a Canadian-made premium hybrid from Serta's Perfect Sleeper® collection (est. 1931), developed in partnership with the National Sleep Foundation to address common sleep problems. The CoolFeel Fabric™ cover provides temperature regulation over the Fiber Layer. The comfort system features 0.5-inch PillowSoft Foam and 0.5-inch Serta Support Foam. The transition system includes 1-inch Serta® Support Foam, Gel Band Support, and 0.5-inch Serta® Balanced Support Pad. The support core consists of the 825 Edition Custom Support Coil System (ranging from 455 in smaller sizes to 1087 in larger sizes) with varying gauge wire (16/15.5/16) and reinforced perimeter. This premium construction is backed by a 10-year warranty.

↔ Scroll table for more details

Layer (Top → Bottom) Material Thickness Notes
1CoolFeel Fabric™ + Fiber LayerQuiltedCool-touch, breathable
2PillowSoft Foam + Serta Support Foam1 in (2.54 cm)Cushioning comfort
3Serta® Support Foam + Gel Band Support + Balanced Support Pad2 in (5.08 cm)Gel-infused transition
4825 Edition Custom Support Coil System7.5 in (19.05 cm)455-1087 coils by size, zoned support

Sleep Position & Body Weight Fit

The firm feel (8/10) and tight-top design make this mattress particularly well-suited for back and stomach sleepers who need a stable, supportive surface to maintain proper spinal alignment. The zoned coil system adds targeted lift under the hips and lumbar area to keep the spine level. Designed in partnership with the National Sleep Foundation, the Perfect Sleeper® helps address common sleep issues including tossing/turning. Side sleepers may find this mattress too firm, as the minimal sinkage (1.58 inches) provides light contouring rather than deep pressure relief at the shoulders and hips.

↔ Scroll table for more details

Sleeper Weight Side Sleepers Back Sleepers Stomach Sleepers
Under 150 lbFairGoodExcellent
150-250 lbGoodExcellentExcellent
250-300 lbGoodExcellentExcellent
300+ lbFairGoodGood

Policies & What To Know

Related shopping help:

Shop all Serta mattresses Shop all Hybrid mattresses Shop Firm mattresses

FAQs

Is the Serta Perfect Sleeper 10.5" Firm Tight Top good for hot sleepers?

Yes, this mattress is exceptional for hot sleepers, scoring a perfect 10.0 for cooling. The CoolFeel Fabric™ cover, gel-infused foams, and 825 Edition Custom Support Coil airflow system regulate temperature effectively. Developed in partnership with the National Sleep Foundation to address sleeping too hot or too cold, temperature observations showed the mattress settling at just 24.6°C (76.3°F), which is among the coolest-sleeping firm mattresses available at this price point.

Does the Serta Perfect Sleeper 10.5" Firm Tight Top feel like you sink in or stay on top?

You will stay firmly on top of this mattress. With only 1.58 inches (4.01 cm) of sinkage and a firm rating (8/10), the tight-top design provides a supportive, on-top sleeping experience with light body contouring. There is no deep-sink or body-hugging sensation with this mattress.

Is it a good choice for couples?

This mattress is exceptional for couples, earning a 9.7 Couples/Intimacy score. Developed in partnership with the National Sleep Foundation to address partner disturbance, it excels in motion isolation (9.0), bounce (10.0), and edge support (10.0). Couples will appreciate the responsive feel for repositioning and the rock-solid edge support that allows both partners to use the full sleep surface.

What sleep positions is it best for?

The Serta Perfect Sleeper 10.5" Firm Tight Top is best suited for back and stomach sleepers who need firm support to prevent hip sinking and maintain proper spinal alignment. The zoned coil system provides targeted lumbar support. Side sleepers may find this mattress too firm; those who sleep primarily on their side should consider a Euro-top or plush option with deeper pressure relief.

How long does off-gassing usually last?

Based on owner feedback and the CertiPUR-US® certified foams used in this mattress, any initial odour is typically low and dissipates within 1 day. Allow the mattress to air out in a well-ventilated room after delivery for best results.

Sealy Boxspring - Spec

 

Purpose of a Boxspring

A boxspring is used to support your mattress and to add height to your bed.

Support – A boxspring will ensure that your mattress is supported properly, and its weight is distributed evenly throughout the bed.  Proper support is essential to maintain the integrity and longevity of your mattress.  A boxspring can be placed directly on the floor, or used with any supportive bedframe.

Height – Boxsprings also add height to your bed.  Whether you like your bed to be lower to the ground, or higher up, you can find various heights of boxpsrings to make your bed just right.  Standard size boxsprings are usually used with bedframes as high as 11 inches off the ground.  If your bedframe is higher than 11 inches, you may want to consider a low profile boxspring to make it easier to get in and out of bed.  These are just guidelines, so we do recommend measuring your existing bedframe and then deciding on the height of the boxspring you require once you have picked out your new mattress.  Mattress heights can differ greatly from one model to another. 

Did you know: Bedframes with supportive slats which are spaced no more than 2 inches apart, typically do not require a boxspring.  However, to add additional support, you may look into a platform foundation which will not raise the overall height of your bed too much (only 2 inches in height) but will add support if you need it.

Matching boxsprings usually have the same colour fabric as your mattress, however mix-match boxsprings are a great option to save some money as they still provide the support your mattress needs, and once you put on bedsheets and a bed skirt you don’t see the colour of the mattress and boxspring anyways.

Greater Toronto Area and Ontario Delivery Map

What's Included

We offer FREE DELIVERY to all major cities in Ontario on orders over $199. A delivery surcharge of $45 applies to orders under $199.

Select your delivery date at checkout and add any special instructions in the order comments. You'll receive a 2‑hour window and live tracking on delivery day.

Greater Toronto Area and Ontario Free Mattress Delivery Map

Ontario Local Delivery Areas

How to Schedule Your Delivery
  • Select Your Date at Checkout — Choose any available slot that fits your calendar.
  • Add Special Instructions — Use the "Order Comments" box for buzz‑codes, parking tips, or gate info.
  • Watch for Confirmation — If your chosen date isn't available, our team will e‑mail an alternative.
  • Day‑of Notifications — Expect a text and e‑mail with a 2‑hour arrival window and live GPS tracking.
Delivery‑Day Checklist
  • Clear Pathways: Remove pictures, décor, and trip hazards from halls & stairs.
  • Protect Floors: Cover delicate surfaces; salt or de‑ice exterior steps in winter.
  • Measure First: Ensure doorways, corners, and stairwells accommodate your mattress—especially King sizes.
  • Big Mattress? If tight squeezes or bends are required, you may be asked to sign a damage waiver.
Service Promise & Safety
  • Fully insured, background‑checked delivery specialists
  • Clean trucks & protective mattress bags on every run
  • Optional removal of old mattresses (select areas & fees)
  • Eco‑friendly recycling partnerships for packaging materials
Need delivery outside Ontario?

We ship select roll‑packed mattresses to all provinces (YT, NT, NU excluded). View Canada-wide shipping options →

Questions About Delivery?

View complete delivery information including FAQs, or contact our team directly.

Full Delivery Details

We cannot change the fabric. This box spring comes with a dark fabric.

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You should only use this for standard king-size mattresses.

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No, it comes in 2 pieces already assembled. Just place them side by side on your bedframe.

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Sealy mattresses are commonly available in standard sizes such as Twin, Twin XL, Full/Double, Queen, King, and sometimes California King. Availability of specific sizes can vary by model and collection, so always confirm which sizes are offered for the...

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Sealy mattresses typically require a supportive, level foundation such as a platform bed, slatted frame with appropriate spacing, adjustable base, or compatible box spring. Using the correct foundation helps maintain proper support, reduces sagging, ...

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With normal use and proper care, a quality Sealy mattress can last many years. Actual lifespan depends on the specific model, materials, the sleepers' weights, and how often the mattress is used; higher-end Sealy models with stronger support systems ...

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Sealy mattresses are typically available in multiple firmness options, including plush/soft, medium, and firm, and occasionally extra-firm or ultra-plush depending on the collection. This makes it easier to match a Sealy mattress to your sleep position...

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Sealy mattresses are widely regarded as offering solid performance and value, especially in the mid-range segment. As with any brand, quality and features vary by collection and price level, so it's helpful to compare specific models, materials, and ...

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Several Sealy mattresses are designed to be compatible with adjustable bases and can bend and flex as the base moves. Check the product description for notes on adjustable base compatibility; if listed as compatible, you can pair this mattress with an...

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Sealy mattresses are generally designed to meet applicable safety and emissions standards for the regions where they are sold. Many models use foams that are tested for content and emissions, and Sealy publishes material and safety information for their...

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The height of this box spring is listed in the product specifications, for example standard height around 8 to 9 inches or low profile around 4 to 5 inches. Check the measurement to see how much it will raise your mattress and whether that fits your ...

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This product page specifies whether the box spring is a single piece or a split construction. For queen and king sizes, look for notes such as "split queen" or "split king" if you need the base to come in two pieces for easier delivery...

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