UltraFlex® Premium Solid Wood Box Spring Mattress Foundation 4" Low Profile - Twin, Double, Queen, King | Premium Heavy Duty Mattress Base, No Assembly Required, Compatible with All Mattress Types- Made in Canada

A truly supportive mattress which begins with the right foundation. At UltraFlex® Mattress, our 4-inch low profile protective corner guard box spring is crafted for sleepers who value added height, reinforced strength, and a dependable base that enhances overall performance. It’s designed to not only support your mattress but to elevate your entire sleep setup.

Built with careful attention to structure and durability, this box spring provides consistent, long-lasting support night after night. Its sturdy internal framework ensures stability you can rely on, while the clean, refined exterior adds a polished look to your bedroom. Every component is thoughtfully engineered to deliver strength, balance, and lasting quality — because a better foundation means better sleep.

Height                            4″
Foundation                    Wooden Slats / Slat Cover Panel
Material                         Solid Wood
Upholstery                     Premium Fabric 
Weight Capacity            800lbs (w/ Mattress)
Assembly Required        No
Packages                       1 Box (2 for King)

Compatible with all UltraFlex® Mattress

Free delivery all over GTHA area (Niagara, Kitchener, Barrie, Oshawa included) 

Solid Maple Wood Construction

The UltraFlex® 4-inch box spring is built with a reinforced solid maple wood frame and thick support slats for long-lasting strength. Its durable structure evenly distributes weight to prevent sagging and maintain mattress performance over time.

Flat, Even Support Surface

A smooth top layer creates a level foundation, ensuring consistent comfort across your mattress. This helps reduce uneven pressure and extends the life of your sleep system.

Universal Compatibility

Designed to work seamlessly with all major mattress types:

• Memory foam
• Latex
• Gel-infused foam
• Innerspring
• Hybrid
• Pocket Coil

An easy fit for new setups or upgrades.

4-Inch Low Profile

The 4-inch height provides a classic, raised bed look while making it easier to get in and out of bed — ideal for standard frames and thicker mattresses.

Stable, Non-Slip Finish

Durable upholstery helps keep your mattress securely in place, reducing shifting and improving sleep stability.

Strong, Reliable Support

Engineered for edge-to-edge strength, this foundation supports substantial weight without sagging, squeaking, or losing integrity.