Search  for anything...
Casper

Casper Sleep Box Spring Foundation for California King Mattress

    • Based on 1,049 reviews
Condition: New
Checking for product changes
$399.00 Why this price?

Buy Now, Pay Later

As low as / mo
  • – Up to 36-month term if approved
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout. Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product
This item's return window has been extended for the holiday season: Returnable until Jan 31, 2025

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: Only 10 left in stock, order soon!
Fulfilled by Amazon
Arrives Saturday, Dec 28
Order within 17 hours and 27 minutes
Available payment plans shown during checkout

Size: California King


Style: Foundation


Pattern Name: Box Spring


Features

  • Foundation dimensions 71.5" W x 83" L x 7.5" H | Metal Bed Frame 72.2" W x 76.7" L x 7.3" H | Weight 88.8 lbs. | Hold weight 750 lbs. | Slats distance from each other 4
  • Ships in a compact box and can be easily assembled in minutes - without any tools | Designed and assembled in the USA; Non-Woven Interior and Slat Upholstery
  • The Casper foundation is engineered to provide excellent support under your Casper mattress but can be used with other mattresses in place of a traditional box spring
  • Engineered with solid wood and rigorously tested for durability and proven to stand up to years of sleep. Slats are positioned a perfect four inches apart for optimal support
  • Compatibility-works with any mattress. Requires a simple metal bed frame, slatted bed frame, or a platform (if you want extra height). The foundation should not be put directly on the floor

Description

Our foundation provides excellent support under any Casper mattress and can be assembled in minutes -- no tools required. It can also be quickly disassembled if you are moving or need to maneuver around tight corners. Older box Springs’ slats tend to be too far apart, leaving room for a mattresses. Our foundation’s slats are positioned a perfect four inches apart for optimal support. Engineered with solid wood, it has been rigorously tested for durability and proven to stand up to years of sleep.

Size: California King


Product Dimensions: 83"L x 71.5"W x 7.5"H


Special Feature: Care Instructions Spot clean the fabric with a mild detergent and let air dry before you continue using. See more


Color: Grey


Included Components: 2X - Center Support Beam, 2X - Side Rail, 4X - Corner Pin, 2X - End Rail, 2X - Foundation Support Slats / Box Spring Support Slats See more


Size: ‎California King


Product Dimensions: ‎83"L x 71.5"W x 7.5"H


Special Feature: ‎Care Instructions Spot clean the fabric with a mild detergent and let air dry before you continue using.


Color: ‎Grey


Included Components: ‎2X - Center Support Beam, 2X - Side Rail, 4X - Corner Pin, 2X - End Rail, 2X - Foundation Support Slats / Box Spring Support Slats


Compatible With Mattress Size: ‎California King


Brand: ‎Casper


Assembly Required: ‎Yes


Ground To Item Distance: ‎7.5 Inches


Manufacturer: ‎Casper Sleep


UPC: ‎192472004812


Global Trade Identification Number: ‎12


Item Weight: ‎83.8 pounds


Country of Origin: ‎China


Item model number: ‎FN00000065


Date First Available: August 16, 2019


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Dec 28

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Well Designed, Sturdy, Easy to Assemble
Size: Full Style: Foundation Pattern Name: Box Spring
I've ordered 3 of these for different locations over the past 3 years. They are very study and easy to put together. Very clever design. Attractive fabric wrap.
Reviewed in the United States on August 18, 2024 by Dawn O then A
    • This is the one to buy!
Size: California King Style: Foundation Pattern Name: Box Spring
If you are looking for a box foundation, this is the one to get! We searched and searched and read tons of reviews on all different types of box springs. After reading so many, we landed on this from Casper. We had purchased a memory foam mattress, and realized it needed just a bit more support than the mattress alone. The biggest difference between this box spring and the others is the material. We had read some reviews about metal box springs, and heard that they eventually would squeak. That is a dealbreaker for us. Casper foundation is made of a sturdy material and comes with the Casper reputation. It was incredibly simple to put together. Just like any square item, you will want to ensure that they are lined up well prior to inserting the pegs. No tools were required. However, we did use a hammer for ease of positioning. It wasn’t necessary though. The difference with this boxspring underneath the mattress is night and day. It was well worth the additional price, and just like purchasing my mattress, the money was well spent. ... show more
Reviewed in the United States on December 29, 2022 by Annie Townsend
    • Solid and Quiiiet
Size: Queen Style: Foundation Pattern Name: Box Spring
This is a solid box spring foundation and has a classy look almost a gray tweed type material, ive matched mine with quiet balance frame and a dream cloud 14in mattress all compliment each other perfectly i also added a headboard and it's all perfection but back to the box spring very sturdy and the assembly was so easy it shipped quickly and the sale price was an instant draw . It's quality , it's a good use of your money you won't feel taken. I'd highly recommend this one. ... show more
Reviewed in the United States on August 27, 2022 by Elizabeth L.
    • Designed to work with Casper System
Size: Queen Style: Foundation Pattern Name: Box Spring
Bought Casper system in Queen for my 270 pound football player son. Easy assembly and sturdy. Second Casper Foundation we've bought. This time we're using a Casper mattress. (Master bedroom has a king with conventional matress on Casper foundation.) Bought the Casper bed frame as well. While the frame was more expensive than generics, it was worth it get something STURDY. Center supports add strength. Bed frame a perfect fit with the foundation. Casper mattress purchased separately at COSTCO at better price than Amazon. Delivery was smooth. I was able to assemble by myself. Recommend opening box and bringing parts upstairs one at a time to assemble in the bedroom. ... show more
Reviewed in the United States on September 4, 2023 by CAPT James Kent, USNR (ret)
    • Works Pretty Well
Size: King Style: Foundation Pattern Name: Box Spring
I got a new bed frame that needed a box spring. After evaluating a number of options I gave this a shot. It's pretty easy to assemble and it provides great support for my Costco Casper mattress. The nice thing is that when I eventually move this will be much easier to deal with than a box spring.
Reviewed in the United States on August 21, 2023 by Daniel
    • Excellent product!
Size: Full Style: Foundation Pattern Name: Box Spring
Excellent product
Reviewed in the United States on April 23, 2024 by A T
    • Adds support
Size: Queen Style: Foundation Pattern Name: Box Spring
I thought I was going to need a mattress. But this foundation has added the needed support and firmness to my existing mattress. I won’t need a new mattress and have saved hundreds of dollars. It is a very solid foundation with wooden slats. High quality for a reasonable price. I paid extra to have it installed and the old foundation taken away. Excellent choice -they were in and out in 15 minutes. (Although the installation is not difficult) ... show more
Reviewed in the United States on July 20, 2022 by WEF
    • Twin Sized
Size: Twin Style: Foundation Pattern Name: Box Spring
I took a gamble buying this since the Amazon site has the wrong size shown. It lists the size of the Casper Twin foundation as 79" in length. That's the right size for a Twin XL (where it shows the same dimension), but would be too long for a twin bed frame and a twin mattress. Fortunately, the twin XL foundation was out of stock, so I reasoned that it couldn't be the same as a twin (which was in stock). I assembled it in about 10 minutes. Good instructions and very easy to do. And measured it. It's the proper length, which is 74". Makes sense, but worth noting so other folks can order with a bit more certainty. Haven't gotten the bed not the mattress yet, but I'm happy with the purchase. Especially so, since the mattress and the foundation together were about $150 less than the exact same mattress by itself! ... show more
Reviewed in the United States on January 9, 2022 by Roger Ronald

Can't find a product?

Find it on Amazon first, then paste the link below.