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***Celebrating 40 YEARS Of Health & Wellness***
***Celebrating 40 YEARS Of Health & Wellness***

Casper One Premium Foam 11" Medium Mattress

by Casper

This product qualifies for free shipping. (Excludes Alaska and Hawaii.)

Original price $695.00 - Original price $1,395.00
Original price
$695.00 - $1,395.00
Current price $695.00
Save $-695.00
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Discover the legendary comfort that broke the Internet with the Casper One Premium Foam Medium Mattress, expertly reimagined to cater to all sleep needs. Renowned as our best all-foam mattress, it boasts a responsive yet supportive medium-firm feel that adapts perfectly to every sleep style. Whether you're a back, stomach, or side sleeper, the Casper One provides the ideal balance of comfort and support, making it the no-brainer choice for your bedroom.

Designed to eliminate overheating, each layer of foam in the Casper One is crafted for all-night breathability. The top layer features breathable polyurethane foam, ensuring a cool and cozy sleep surface, while the second layer, made of Align Memory Foam, cradles your body's natural curves to promote uninterrupted sleep. Supporting these layers is the Casper Core, a durable base that prevents sinking and sagging, ensuring long-lasting support.

Enhanced with a soft knit Cozy Cover, the Casper One Premium Foam Medium Mattress wraps you in luxurious comfort from the moment you lie down. Its classic Casper feel offers responsive, supportive foam with just the right amount of bounce, providing the comfort our sleepers love. Perfected over 10 years based on customer feedback, the Casper One is engineered to be as durable as it is cozy, delivering a sleep experience that exceeds expectations.

Features & Benefits
  • Medium-Firm Feel - Provides a responsive yet supportive feel that adapts to any sleep style.
  • Overheating Prevention - Every layer of foam is designed for all-night breathability, ensuring a cool and comfortable sleep experience.
  • Pressure-Relieving Comfort - Three layers of supportive, pressure-relieving foam soothe your body for a restful night's sleep.
  • Align Memory Foam - Cradles the natural curve of your body to help you stay asleep and maintain proper alignment.
  • Casper Core - Durable base prevents sinking and sagging, ensuring long-lasting support.
  • Cozy Cover - Soft knit cover enhances the mattress's coziness, making it even more inviting.
  • Classic Casper Feel - Responsive, supportive foam with the perfect bit of bounce that our sleepers love.
  • Long-Lasting Support - Engineered to be as durable as it is cozy, providing lasting comfort and support.
  • 10 Years of Feedback - Perfected over a decade with customer feedback to ensure exceptional quality and comfort.
  • Ideal For - Back and stomach sleepers seeking a supportive and comfortable mattress choice.
Specifications & Details
  • Twin Dimensions: 38”W x 75”L x 11"H
  • Twin Long Dimensions: 38”W x 80”L x 11"H
  • Full Dimensions: 53”W x 75”L x 11"H
  • Queen Dimensions: 60”W x 80”L x 11"H
  • King Dimensions: 76”W x 80”L x 11"H
  • CA King Dimensions: 72”W x 84”L x 11"H

10-Year Limited Warranty

Shipping Information
  • Curbside Shipping: 1-2 business days from the date of the order.
  • White Glove Delivery: 7-14 business days from the date of the order.

The One for every body. And everybody.



Responsive, supportive foam with the perfect bit of bounce our sleepers love.

Perfected Over 10 Years

Perfected Over 10 Years

We redesigned our “one perfect mattress” with 10 years of feedback to make it even more perfect-er.

Casper mattress breakdown of layers.


Layers of premium foam are engineered to be as durable as they are cozy.

Frequently Asked Questions

Does The One memory foam mattress sleep hot? Show Item Content

All of our mattresses are specifically designed to sleep cool. We run thermal imaging tests and sweat tests to make sure our mattresses feel nice and breezy throughout the night to keep you comfortable.

If sleeping hot is a challenge for you, Snow Technology is our most advanced solution to nighttime overheating. The combination of HeatDelete™ Bands, Phase Change Material, and cooling Snow Cover keep you comfortably cool from the moment you crawl into bed.

Which is the firmest mattress in the assortment? Show Item Content

The “One” is the firmest mattress in our collection. It is an all-foam mattress made with Breath Flex Foam, Align Memory Foam, and a Casper Core for those seeking the best memory foam mattress experience at an affordable price. The One is firmer than our previous value model, The Casper.

I have The Casper and I wanted another. Which mattress should I buy now? Show Item Content

If you loved the Casper you'll love the upgraded One. This all-in-one sleep solution is slightly firmer but still has the signature Casper feel. The all foam mattress is made with Breath Flex Foam, Align Memory Foam, and a Casper Core, making it an excellent choice for anyone looking for a memory foam mattress upgrade.

What kinds of bed frames are compatible with Casper mattresses? Show Item Content

Casper mattresses are designed to work on a firm, solid surface like our foundation, platform, or adjustable bed frame. Having the correct support ensures the performance and longevity of memory foam mattresses.

For slatted frames, we recommend using bed slats that are flat (not bowed), wooden, and no more than 4 inches apart.

What is a mattress in a box? How long does it take for a Casper mattress to expand? Show Item Content

A mattress in a box is a mattress that’s compressed in an air-sealed bag and rolled tight so that it can fit into a box that’s easier to maneuver than a traditional mattress. Allowing you the flexibility and convenience of picking your mattress online and having it easily delivered to your door.

When you receive the mattress, all you’ll need to do is pull it out of its packaging, lay it flat on your bed frame or floor, and let it expand.

Foam and hybrid mattresses can be slept on almost right away but may take up to 48 hours to expand fully. Our Snow mattresses are primarily made with memory foam and can take up to 72 hours to expand fully.

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