Skip to product information
1 of 4

Foundation | Low Profile (4.5")

Foundation | Low Profile (4.5")

Low 4.5" Steel Box Spring Base

6.7k+ people bought

bestseller badge

Best Seller

  • Lower Profile Design: Perfect for reducing bed height while maintaining full support.
  • Durable Steel Grid Support: Semi-Flex® system outperforms wood foundations in strength and longevity.
  • Non-Skid Top Surface: Keeps your mattress in place all night long.
  • Quiet & Creak-Free: Welded steel construction eliminates squeaks and flexing.
  • No Setup Needed: Arrives fully assembled—ready to use right out of the box.
Size Size guide

Twin

$130

Twin XL

$150

Full

$160

Queen

$180

King

$300

Total Price
$160.00

In stock. Delivery by August 23

Our benefits

2,100+ Five Star Reviews

Free One-Day Delivery

10 Year Warranty

Learn more

Materials

Engineered Semi-Flex® performance grid made from galvanized steel rods, reinforced with wood slats for long-term durability. Wrapped in a black fabric finish with a non-skid top to prevent mattress movement. Compact 4.5" profile offers a modern, low-rise look while maintaining strong support.

Warranty

10-Year Limited Warranty

We back the quality of your foundation with a 10-year limited warranty covering defects in materials and workmanship when used as directed.

View full warranty details

Where it’s made

Made in USA: Built in Oklahoma

Need help?

Our experts receive extensive training so you can get your best night’s sleep.


OR


Visit us in-store to find your best mattress and sleep essentials - customized for your needs.

View full details

Customer Reviews

Discover what our customers say about Mattress King.

4.9

2,148 reviews

Frequently Asked Questions

Why would I choose a low-profile foundation over a standard one?

A low-profile foundation lowers your overall bed height, making it easier to get in and out—perfect for higher mattresses or aesthetic preference.

Is this 4.5" foundation as strong as a standard 9" version?

Yes. It uses the same steel-reinforced Semi-Flex® grid and wood support structure, delivering the same strength in a slimmer form.

Can this low-profile foundation be used on any bed frame?

Yes, it’s compatible with all standard-size bed frames and offers excellent support for all mattress types

Will this foundation help prevent mattress sliding?

Absolutely. It features a non-skid top fabric that helps hold your mattress securely in place.