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The Foundation

Price: $349

The Foundation

Price: $349
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In-stock, ships in 1-2 business days | Free shipping & returns
Price: $349
Price: $349

Got questions?

Our friendly Sleep Specialists are here to help. Give us a call now or visit your local store.

Give us a call: +1 888.498.0003

Why you’ll love it:

We reinvented the box spring. Our foundation provides excellent support under any Casper mattress and can be assembled in minutes. The Foundation also comes with a 30-night, risk-free trial.

Add an optional metal bed frame with the Foundation and any Casper mattress to create a perfect sleep setup.

Need replacement Casper Foundation pins? Shop Foundation Pin

Don't Lose Sleep


74" x 37.5" x 7.5"

Twin XL

79" x 37.5" x 7.5"


74" x 52.5" x 7.5"


79" x 59.5" x 7.5"


79" x 75.5" x 7.5"

California King

71.5" x 83" x 7.5"

Solid and/or Engineered Wood Frame and Slats Woven Exterior Upholstery Non-Woven Interior and Slat Upholstery

Free shipping and free returns.

Select products ineligible for free shipping where indicated. Free shipping excludes Alaska and Hawaii.

We ship via UPS.

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.

The Foundation

No-tool easy assembly

Ratings & Reviews

331 Reviews
4.6 out of 5.0

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  • (5 Stars)


    Great foundation, really easy to put together. Very simple! I love that and also if not cheap it’s really great quality material so I’m very pleased about my purchase. Great quality is something that is lacking in a lot of companies today. Casper has a higher standard of quality! Thank you for that.

    Product: The Foundation

    Disclaimer: This review is of a mattress of a comparable feel.

    Gift Icon This review was incentivized.

  • (5 Stars)

    Extremely pleased

    We ordered the foundation after already having a Casper mattress and it made it at least 10 times better.

    Product: The Foundation

    Disclaimer: This review is of a mattress of a comparable feel.

    Gift Icon This review was incentivized.

  • (5 Stars)

    Great addition

    We purchased the foundation to go with our Casper mattress and bedframe. It is a perfect addition - just raising it an extra 8 inches and providing a very comfortable and supportive sleep. Highly recommend.

    Product: The Foundation

    Disclaimer: This review is of a mattress of a comparable feel.

  • (5 Stars)

    Easy to assemble

    Very easy to assemble. Very sturdy , and looks great. My only negative would be that the slats were not centered in the material. This made it a little difficult to center on the foundation , without the material showing between the matress and foundation.

    Product: The Foundation

    Disclaimer: This review is of a mattress of a comparable feel.

  • (5 Stars)

    Casper Foundation review Vargas

    Excellent!! Very sturdy!! Solid for the mattress and overall structure very sound!!

    Product: The Foundation

    Disclaimer: This review is of a mattress of a comparable feel.

    Gift Icon This review was incentivized.

Showing 1 to 5 of 331 results

Frequently Asked Questions

We don’t recommend putting the Casper foundation directly on the floor. The chambray upholstering that covers the foundation’s sides is not designed for it. Doing so can cause unsightly wear and we want your Casper bed set to stay in perfect condition — and be eligible for warranty. Mattress foundations are best paired with a sturdy metal frame to ensure maximum durability and longevity.

Much like the foundation of your home, a mattress foundation provides critical support for the entire bed. To keep sagging at bay, you need a strong and leveled base for your new mattress. This is especially true for memory foam mattresses and innerspring mattresses, as they require adequate support to maintain their structure.

At Casper, our mattress foundations are designed to protect all mattresses from degradation, no matter the bed frame or material. For sleepers with no bed base or just an old box spring, it’s time for an upgrade to truly complement your mattress purchase.

Unlike old box springs and sagging foundations, a quality mattress base provides a solid surface that ensures lasting support. Your mattress will remain in peak condition for years to come, alongside many sleep-supporting benefits:

  • Improved sleep and comfort
  • No mattress sagging
  • Secured mattress placement
  • Improved airflow

Alongside Casper mattresses, our foundations are designed for long-lasting support. With our compact slatted foundation design, you won’t be bothered by gaps or sharp pressure points.

In short, one that protects your mattress and improves your sleep. Mattress bases range from metal slats to solid platforms. At Casper, we believe the best mattress foundation is our wooden slat model. The closely-spaced beams evenly level your mattress, providing structure without sacrificing comfort. This bed base is great for all types of mattresses, including memory foam, innerspring, and hybrid mattresses, and provides greater support compared to a traditional box spring or foundation.

Not quite. Both foundations and box springs provide a base support layer for any mattress type. However, box springs add a little extra give and increase breathability, while foundations are for overall support.

A box spring is any wood or metal bed frame containing coiled springs covered by cloth. This once-popular design is now mostly found on older beds.

A foundation is any non-spring bed base, from metal or wooden slats to solid platforms. Slat models, often referred to as slatted foundations, provide more air circulation and flexibility, while solid bases give the firmest support.

Both slats and solid foundations are an ideal box spring alternative for better mattress protection.

Learn more in our guide on Platform Bed vs. Box Spring.

The ideal height for a foundation is between six and twelve inches. Shorter mattresses might benefit from a taller foundation and taller mattresses from a shorter base. When it’s all evened out with a bed frame and mattress, most beds are about two feet tall, though it’s really a matter of personal preference. Our mattress base measures 7.5” high, making it compatible with most beds.