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Mainstays 5" California King High Profile Easy Assembly Smart Metal Box Spring

Name: Mainstays 5" California King High Profile Easy Assembly Smart Metal Box Spring
Brand: Mainstays
SKU: 868940658
Availability: OutOfStock
Rating: 4.5 (17490 reviews)

4.5 stars out of 17490 reviews

(4.5)|

17.4K ratings

Mainstays 5" California King High Profile Easy Assembly Smart Metal Box Spring Mainstays 5 California King High Profile Easy Assembly Smart Metal Box Spring Mainstays 5 King High Profile Easy Assembly Smart Metal Box Spring Mainstays 5 Twin High Profile Easy Assembly Smart Metal Box Spring Mainstays 5 Queen High Profile Easy Assembly Smart Metal Box Spring

Key item features

Easy Setup: Sets up easily in seconds with no tools required.
Innovative Design: Folds up for convenient storage and transport when not in use.
Ultra-Sturdy Support: Provides strong support for any innerspring, memory foam, or combination mattress.
Durable Construction: Made with a powder-coated steel frame for long-lasting use.
Weight Capacity: Supports up to 1200 lbs. for Full, Queen, King, and California King sizes; up to 600 lbs. for Twin and Twin XL sizes.
Multiple Sizes: Available in Twin, Twin XL, Full, Queen, King, and California King sizes.
Polyester Cover: Features a 100% polyester jacquard cover to prevent mattress shifting.
Dimensions: California King dimensions: 83" x 71" x 5"H - 43.63 lbs.; shipping dimensions: 74" x 11.2" x 6.1" - 48.6 lbs.

Generated by AI

Specs

Box spring type
Mattress Foundation
Material
Metal, Jacquard
Max load
1200 lb
Features
Foldable
Height
5 in
Assembly req
Y

Reviews summary

Pros

: Quick and straightforward process requiring no tools.
: Made with robust materials and a solid build.
: Offers great value at this cost.

Neutral

: Can be snug, but also inconsistent across users.
: Can be sturdy, but may also be prone to warping or bending.
: Can be snug, but also prone to sizing issues.

Generated by AI

Price when purchased online

Not Available

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About this item

Product details

Set yourself up for a great night's sleep with the Mainstays 5" White Jacquard Smart Box Spring. Offers the look and functionality of a traditional box spring but made from steel providing ultra-sturdy support for any innerspring, memory foam or combination mattress, features a 100% polyester jacquard covering that prevents shifting. This innovative box spring is designed to easily fold up for convenient storage and transport when not in use. The Mainstays 5" White Jacquard Smart Box Spring sets up in seconds with no tools required and is available in Twin, Twin XL, Full, Queen, King, and California King sizes.

Sets up easily in seconds
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.
Features a 100% polyester jacquard cover
Constructed with a durable powder coated steel frame for a long life and reliable use
Easy to assemble with no tools required
Available in Twin, Twin XL, Full, Queen, King, and California King sizes
Twin and Twin XL can support up to 600 lbs. total weight capacity
Full, Queen, King, and California King can support up to 1200 lbs. total weight capacity
Mattresses and bed frames sold separately
Please see our assortment of mattresses
Assembled Product Dimensions:
- Twin dimensions: 74" x 38" x 5"H - 23.83 lbs.
- Twin XL dimensions: 79" x 38" x 5"H - 24.43 lbs.
- Full dimensions: 74" x 53" x 5"H - 34 lbs.
- Queen dimensions: 79" x 59" x 5"H - 37.4 lbs.
- King dimensions: 79" x 75" x 5"H - 44.58 lbs.
- California King dimensions: 83" x 71" x 5"H - 43.63 lbs.
Shipping Product Dimensions:
- Twin shipping dimensions: 41.3" x 11.2" x 6.1" - 27.64 lbs.
- Twin XL shipping dimensions: 42.1" x 10.8" x 6.1" - 28.13 lbs.
- Full shipping dimensions: 56.3" x 11.2" x 6.1" - 38.8 lbs.
- Queen shipping dimensions: 62.4" x 11.2" x 6.1" - 42.6 lbs.
- King shipping dimensions: 78.5" x 11.2" x 6.1" - 50.42 lbs.
- California King shipping dimensions: 74" x 11.2" x 6.1" - 48.6 lbs.

info:

We aim to show you accurate product information. Manufacturers, suppliers and others provide what you see here, and we have not verified it.

Specifications

Box spring type

Mattress Foundation

Material

Metal, Jacquard

Max load

1200 lb

Features

Foldable

Warranty

Warranty information

Limited Five (5) Year Warranty, Warranty available to original purchaser only. Proof of purchase is required. This warranty is your sole remedy for product defects only and does not cover damage due to mishandling, misuse, or abuse. The defects include circumstances where the frame is broken under normal use and no longer performs its function. The manufacturer is not responsible for incidental or consequential damages. This warranty gives you specific legal rights and you may also have other rights which vary from state to state. Our product is designed and manufactured to meet the highest quality standards. In the event that you have assembly questions, or parts are missing or damaged, please let us know before you decide to return your product to the store. Please contact customer service directly at: Email: CustomerService@gesin-cn.com Service Hours: Central Standard Time Monday - Friday: 9:00am - 4:00pm 1-800-681-0084 Thank you for purchasing our products. Inno-Sports Co., Ltd

Warranty url

https://res.cloudinary.com/inno-sports-co-ltd/image/upload/v1697137244/Warranty_URL_yufk3l.jpg

Customer ratings & reviews

4.5 out of 5 stars

stars17.4K ratings8,115 reviews

How item rating is calculated

Reviews summary

Pros

: Quick and straightforward process requiring no tools.
: Made with robust materials and a solid build.
: Offers great value at this cost.

Neutral

: Can be snug, but also inconsistent across users.
: Can be sturdy, but may also be prone to warping or bending.
: Can be snug, but also prone to sizing issues.

Generated by AI

Customer photos

+545 images

Filtered and sorted results would be available on the new 'Customer ratings & reviews' page.

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Showing 1-3 of 8,115 reviews

Jul 17, 2025

Angelina

Item details

Bed size: King

5 out of 5 stars review

Verified Purchase

Highly recommend 👌

Im on day one of having this and can already feel a big difference in support for this King 100 lb mattress our frame only has wood slats and wasnt enough plus this gave us the perfect height we wanted for our bed. The assembly was RIDICULOUSLY easy, no screws, no tools needed GREAT, took me literally 10/15 mins to put together. Was going to spend $150 for a 4 inch one on Amazon but happy i took this chance on Mainstay brand. Metal feels sturdy, the cover was easy to slip on.

Helpful?

Jan 29, 2026

Rob

Item details

Bed size: King

5 out of 5 stars review

Verified Purchase

Sturdy and Easy to Assemble

The box spring was surprisingly easy to assemble by one person. Most of the interior structure is preassembled and merely needs to be unfolded. The cover was very easy to zip up over the assembled frame. Once assembled, the item is very sturdy. It fit into our antique bed frame perfectly, without the need for any bed slats.

Helpful?

Feb 15, 2026

Niki

Item details

Bed size: Queen

5 out of 5 stars review

Verified Purchase

Easy!

This was so easy to assemble. It looks intimidating when you first unbox it but it's nothing more than just snapping parts together. No tools needed! I ordered a king size and assembled this in less than 10 mins. The cover is easy just unzip all the way and tuck in box spring then re-zip. It's very sturdy not squeaking or noises and is supporting my hybrid mattress nicely

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Mainstays 5" California King High Profile Easy Assembly Smart Metal Box Spring

Key item features

Specs

Reviews summary

Pros

Neutral

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About this item

Product details

Specifications

Box spring type

Material

Max load

Features

Warranty

Warranty information

Warranty url

Customer ratings & reviews

Reviews summary

Pros

Neutral