Mainstays 9" King High Profile Easy Assembly Smart Metal Box Spring
Mainstays 9" King High Profile Easy Assembly Smart Metal Box Spring
Hero image 0 of Mainstays 9" King High Profile Easy Assembly Smart Metal Box Spring, 0 of 10
Overall pick
Mainstays

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

9,963 ratings
Mainstays 9" King High Profile Easy Assembly Smart Metal Box SpringMainstays 9 King High Profile Easy Assembly Smart Metal Box SpringMainstays 9 Full High Profile Easy Assembly Smart Metal Box SpringMainstays 9 Twin High Profile Easy Assembly Smart Metal Box SpringMainstays 9 Queen High Profile Easy Assembly Smart Metal Box SpringMainstays 9 Twin XL High Profile Easy Assembly Smart Metal Box Spring

Key item features

  • Effortless Setup: This King-sized box spring assembles easily in seconds without tools, offering quick and convenient preparation for use.
  • Smart Portability: Its innovative design allows the box spring to fold up for simple storage and transport when not actively in use.
  • Robust Support: Provides ultra-sturdy support for various mattress types, including innerspring, memory foam, or combination mattresses.
  • Durable Construction: Features a durable powder-coated steel frame and a 100% polyester jacquard cover for long-lasting reliability.
  • Generous Capacity: The King size supports a total weight capacity of up to 1200 lbs, ensuring strong and stable mattress support.
  • King Dimensions: Assembled, the King box spring measures 79" x 75" x 9"H and weighs 48.04 lbs.
Generated by AI
Price when purchased online
Not Available

How do you want your item?

How do you want your item?
Not available

About this item

Product details

Specifications

Warranty

Customer ratings & reviews

4.5 out of 5 stars
stars
9,963 ratings4,167 reviews
How item rating is calculated
  1. 5 stars78% (7,743)
  2. 4 stars9% (868)
  3. 3 stars3% (332)
  4. 2 stars2% (226)
  5. 1 star8% (794)

Reviews summary

Pros

  • : Setup requires minimal effort and no tools.
  • : Made with a robust build that can withstand use.
  • : Offers decent to excellent quality at a reasonable cost.
  • : Fits bed frames of various sizes.

Neutral

  • : Can be perfect for some, but may not fit others due to size variations.
  • : Can be snug, but may require effort to fit or be too small.
Generated by AI
Filtered and sorted results would be available on the new 'Customer ratings & reviews' page.
Sort by |

Showing 1-3 of 4,167 reviews

Jul 9, 2025
WalmartCustomer
Item details
Bed size: Full
5 out of 5 stars review

Verified Purchase

We was in need of a Bed Box Spring. So, I browsed Walmart Website. And we found exactly what we needed. But, we never purchased a Box Spring that you had to assemble. But the assembling was easy. Thank Walmart, again for coming through in our time of need.

Incentivized Review
Helpful?78f4cf10-4508-11f0-b3a2-1fa7e18da776269289262
Sep 24, 2025
ZoeB
Item details
Bed size: Twin
5 out of 5 stars review

Verified Purchase

This "box spring" has no springs, but it looks identical to a box spring. But the huge bonus is that due to it being in a smallish box, it will fit through virtually any doorway or up/down any set of stairs. For that reason, it is a terrific bargain. It is also extremely easy to put together and very sturdy. Don't hesitate to buy this if you have a tight space to maneuver or even if you don't!

Helpful?78f4cf10-4508-11f0-b3a2-1fa7e18da776269289262
Jan 12, 2026
Kimberly
Item details
Bed size: Full
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

Easy Assembly Box Spring

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!

Helpful?78f4cf10-4508-11f0-b3a2-1fa7e18da776269289262