Name: Mainstays 9" King High Profile Easy Assembly Smart Metal Box Spring
Brand: Mainstays
SKU: 6000200332078
Availability: OutOfStock
Rating: 4.4 (196 reviews)

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Mainstays 9" King High Profile Easy Assembly Smart Metal Box Spring

It unfolds and sets up in seconds without needing any tools.

No Tools Required

The folding design makes it easy to transport through tight hallways and store away.

Folds For Easy Moving

A durable steel frame provides strong, reliable support for up to 1200 pounds.

Supports 1200 Pounds

It provides flat, sturdy support for memory foam, spring, or hybrid mattresses.

Fits Any Mattress Type

<ul><li>Quick Assembly: Sets up easily in seconds with no tools required.</li><li>Foldable Design: Allows the box spring to easily fold up for storage and transport when not in use.</li><li>Sturdy Mattress Support: Provides ultra-sturdy support for any innerspring, memory foam, or combination mattress.</li><li>Durable Construction: Constructed with a powder coated steel frame and a 100% polyester jacquard cover.</li><li>High Weight Capacity: King size can support up to 1200 lbs. total weight.</li></ul>

Foldable <ul><li>Mainstays 9" White Jacquard Smart Box Spring.</li><li>Sets up easily in seconds.</li><li>An innovative design allows the box spring to easily fold up for storage and transport when not in use. Provides ultra-sturdy support for any innerspring, memory foam, or combination mattress.</li><li>Features a 100% polyester jacquard cover.</li><li>• Constructed with a durable powder coated steel frame for a long life of reliable use. • Easy to assemble with no tools required</li><li>• Available in Twin, Twin XL, Full, Queen, King, and California King sizes • King can support up to 1200 lbs. total weight capacity. • King dimensions: 79" x 75.5" x 9"; 48.04 lbs. •This item ships in one large box that may not fit into a standard-sized vehicle. Please make sure you have a large car or truck for store pickup. • King shipping dimensions: 78.5" x 11.2" x 10"; 54.06 lbs.</li><li>Mattresses and beds sold separately</li></ul>

Bed Size

Box Spring Type

Profile

Material

Brand

Maximum Load Weight

Features

Assembled Product Dimensions (L x W x H)

Is Assembly Required

Colour

Items Included

Split Box Spring

Assembled Product Weight

Set yourself up for a great night's sleep with the Mainstays 9" White Jacquard Smart Box Spring. This innovative box spring is designed to easily fold up for convenient storage and transport when not in use. Providing ultra-sturdy support for any innerspring, memory foam, or combination mattress, the box spring features 100% polyester jacquard covering, durable powder coated steel for a long life of reliable use. The Mainstays 9" White Jacquard Smart Box Spring sets up in seconds and is available in Twin, Twin XL, Full, Queen, King, and California King sizes to create the perfect sleeping platform in any bedroom.

Manufacturer Part Number

Assembly Instructions

Universal Product Code (UPC check)

Walmart Item #

Mainstays Easy Assembly Smart Metal Box Spring

Twin-XL

King

California King

Value For Money

Ease Of Assembly

Sturdiness

Size Compatibility

Build Quality

Cover Fit

Size

Whoever came up with this idea for the easy assembly boxspring is a genius. Box springs are one of the hardest things to move since they do not bend in are difficult to get up a stairwell. And this being made of metal is more sturdy than a wooden framed one this will be very easy to disassemble and fold up when I move and transport to the next home.  I wish I thought of this myself.  Pure genius!

Easy Assembly Box Spring

walmart.com

Very easy to assemble and sturdy . Bought for my king size bed and still in great shape after 5 months!!! Great price!!!

Perfect!

I have arthritis in my feet and knees.  We actually bought this to raise the height of our bed to make it easier for me to stand up. 
We were told when we bought our very expensive memory foam mattress 2 years ago that it didn't require a box spring.  This has brought new memory to our mattress!   
I am amazed at how comfortable my mattress is now!  I can actually wake up without aches and pains!

Very easy to assemble and it doesn't squeak

It seems very sturdy and the best part, it was easy to put together. No weird smells. The cover didn't really even smell, which is impressive. The cover was a little tricky to get on, but not too bad. Overally extremely pleased with this purchase.

Very easy assembly, quality item.

This probably took 5 minutes to put together, it's super sturdy, and great quality to be honest!! I was shocked at how simple the set up was. I was nervous about the quality of the metal but it's honestly so sturdy! Great value! We got it on sale and I couldn't be happier.

Awesome!

It's cool but a little confusing because of the top (no information or description on that bottom mattress), whenever I put the mattress in it collapsed I was like what's wrong with it ? So I had to flip it over and try it again..and now it holds up good.

Fairly easy to assemble but the cover that comes with it does not fit.

we ordered this box springs October 17, 2025 and it didn't even last a year before it started breaking.  Normal wear and every time you get on the bed you hear the bars falling where it broke.  i will nev

Mainstays 9" King High Profile Easy Assembly Smart Metal Box Spring shown in a 3/4 angled view with a white 100% polyester jacquard cover and black fabric bottom, featuring a durable powder-coated steel frame for sturdy mattress support and easy folding for storage and transport, suitable for bedroom furniture.

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Mainstays 9" King High Profile Easy Assembly Smart Metal Box Spring

Key item features

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Your data, your choice

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Mainstays 9" King High Profile Easy Assembly Smart Metal Box Spring

Key item features

Specifications

EGOHOME 9 inch Queen Size Metal Box Spring, Easy Assembly Mattress Foundation, 80"60"9"