At 72” wide and 84” long, the Casper California King Mattress is the largest size offered. It’s ideal for couples, parents who share the bed with small children, and taller individuals who require extra leg room. Given its dimensions, it fits best in spacious master bedroom. Like all Casper mattresses, it will provide contouring support and keep you cool through the night.
After more than 30 engineering improvements and nearly half a million happy customers, the Casper mattress leaves you feeling perfectly supported and practically weightless. It’s more breathable and comfortable than ever.
Since launch, we’ve continuously improved this mattress based on research, data, and feedback from our community of more than 400,000 customers. These updates include adding a fourth layer to increase pressure relief, developing proprietary foams for added durability and breathability, and creating a removable cover that’s easier to clean.
See how we evaluate our products
Our R&D team uses three main methods to inform product improvements:
In the beginning, we created beta models and invited friends and seasoned snoozers to A/B test them. We continue to enlist Casper customers to test improvements.
We do feel testing, force profile testing, airflow testing, rebound testing, compression testing... well, you get the idea. Finally, we simulate 10 years of sleep to make sure it will last and last.
Our dedicated research team conducts interviews and runs studies to understand sleep habits. These learnings help us make products that reflect real people’s needs.
“Supremely comfortable”
Unlike traditional memory foam mattresses, the Casper is designed to help you sleep cool. The open-cell top layer uses convection and conduction to flow heat away from your body. Similarly, the memory foam layer leverages airflow to pull heat out of the top layer, leaving you cool and comfortable.
Open-cell top layer & airflow regulation
Why does heat flow matter?
While you’re asleep, your body acts like a little thermal engine, putting out the equivalent heat of a 100W light bulb. By using foams that leverage convection (heat transfer through air) and conduction (heat transfer through solids), we’re able to pull heat away from your body, and disperse it back into the atmosphere.
We flipped the mattress industry on its head by eliminating showrooms, employing smart logistics, and using compression technology to ship the Casper in a compact box. This allows us to offer a premium mattress for a fraction of the price.
“Changing the way people shop for mattresses”
Sleep on it, lounge on it, dream on it — if you don't love it, we'll give you a full refund. No springs attached.
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We designed the Casper mattress to be versatile, so it can work with all standard foundations. As with all foam beds, you want as much direct support under the mattress as possible. A wooden slatted or platform bed offers the most support. For optimal support under all sizes ( twin, twin XL, full, queen, king, Cal king ) , we suggest using the Casper foundation.
The engineering behind Casper products goes far beyond aesthetics. Our mattresses are the result of intensive research and continuous development by our 30-person San Francisco R&D team, who collectively hold more than 50 patents. Unlike putting a cover over an off-the-shelf construction, our approach allows us to quickly respond to customer feedback and continually enhance our products. As a result, the original Casper mattress has received high praise from Consumer Reports, was named one of Time magazine’s best inventions, and holds multiple industrial design awards.
All the foams in Casper mattresses are CertiPUR-US® certified. These foams are made without ozone depleters, PBDE flame retardants, mercury, lead and other heavy metals, formaldehyde, phthalates regulated by the Consumer Product Safety Commission. They are Low VOC (Volatile Organic Compound) emissions for indoor air quality (less than 0.5 parts per million).
