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Casper The One Medium All Foam Twin Size Mattress

MODEL:

CASPRONE-T
3.3 out of 5 Customer Rating
Casper The One Medium All Foam Twin Size Mattress is rated 4.5 out of 5 by 937.
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View all Casper Twin Mattresses
Casper The One Medium All Foam Twin Size Mattress, , hires
Casper The One Medium All Foam Twin Size Mattress, , hires
Casper The One Medium All Foam Twin Size Mattress, , hires
Casper The One Medium All Foam Twin Size Mattress, , hires
Casper The One Medium All Foam Twin Size Mattress, , hires
Casper The One Medium All Foam Twin Size Mattress, , hires
Casper The One Medium All Foam Twin Size Mattress, , hires Casper The One Medium All Foam Twin Size Mattress, , hires
90 Night Sleep Guarantee
90 Night Sleep Guarantee
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Casper The One Medium All Foam Twin Size Mattress, , hires
Casper The One Medium All Foam Twin Size Mattress, , hires Casper The One Medium All Foam Twin Size Mattress, , hires
Click on image to Zoom
Casper The One Medium All Foam Twin Size Mattress, , hires
Casper The One Medium All Foam Twin Size Mattress, , hires Casper The One Medium All Foam Twin Size Mattress, , hires
Click on image to Zoom
Casper The One Medium All Foam Twin Size Mattress, , hires
Casper The One Medium All Foam Twin Size Mattress, , hires Casper The One Medium All Foam Twin Size Mattress, , hires
Click on image to Zoom
Casper The One Medium All Foam Twin Size Mattress, , hires
Casper The One Medium All Foam Twin Size Mattress, , hires Casper The One Medium All Foam Twin Size Mattress, , hires
Click on image to Zoom

Key Features

  • Type: All Foam
  • Size: Twin
  • Comfort Level: Medium
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90 Night Sleep Guarantee If you are dissatisfied with the comfort of your mattress, you can exchange or change it. Learn More! If you are dissatisfied with the comfort of your mattress, you can exchange or change it. Learn More!

90 Night Sleep Guarantee If you are dissatisfied with the comfort of your mattress, you can exchange or change it. Learn More! If you are dissatisfied with the comfort of your mattress, you can exchange or change it. Learn More!

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About this Item

Casper The One Mattress

The One is Casper's expertly engineered all-foam mattress, built with three layers of cradling foam to deliver a responsive, medium-firm feel that makes quality sleep accessible without breaking the bank.

Casper One foam mattress on a white metal bed frame with striped and round pillows, styled in a modern bedroom.
What if better sleep didn't have to cost more?

The One is Casper's signature affordable foam mattress, featuring three thoughtfully engineered foam layers that work together to cradle your body, relieve pressure, and support restful sleep night after night. Its medium-firm feel strikes the balance between plush comfort and dependable support --- delivering the kind of sleep experience typically reserved for higher-priced mattresses.

Backed by a 90-Night Sleep Trial, The One lets you experience the difference Casper's foam engineering makes --- completely risk-free.

Who Is The One For?

The One is an ideal match for back sleepersandside sleeperswho need balanced pressure relief and spinal alignment without paying a premium price. Its foam construction contours closely to the body, making it especially well-suited forcombination sleepers who shift positions during the night and want consistent comfort throughout. Budget-conscious shoppers who don't want to compromise on sleep quality will find The One a dependable, long-lasting solution.

Pressure Relief & Body Contouring

The One's comfort foam layers conform closely to the body's curves, gently cradling pressure points at the shoulders and hips. This targeted contouring helps reduce aches and pains, particularly for side and back sleepers who need extra cushioning at key contact areas throughout the night.

Motion Isolation

The foam construction of The One absorbs and dampens motion transfer naturally, preventing disturbances from traveling across the mattress surface. This makes it a great choice for couples or light sleepers who need to stay undisturbed even when a partner shifts positions or gets in and out of bed.

Responsive, Medium-Firm Support

The One's three-layer foam system delivers a medium-firm feel that provides responsive pushback to keep your spine properly aligned while you sleep. The supportive base foam ensures the mattress holds its shape over time, maintaining consistent comfort for a wide range of body types and sleep styles.

Three Layers of Foam, Engineered for Better Sleep

The One is built from the ground up with three distinct foam layers, each designed to serve a specific purpose in delivering comfortable, supported sleep. From the durable base that anchors the mattress to the breathable comfort layer on top, every inch is thoughtfully constructed to balance softness and structure.

  • Durable Foam Base --- stays supportive year after year, maintaining the mattress's shape and preventing sagging over time
  • Cradling Memory Foam --- keeps you aligned and asleep by contouring to your body and supporting proper spinal position
  • Breathable Comfort Layer --- helps you get cozy from the moment you lie down, softening the surface for a welcoming feel
  • Medium-Firm Feel --- a universally comfortable firmness level designed to suit back, side, and combination sleepers
Diagram of the Casper One mattress layers: breathable comfort layer, cradling memory foam for alignment, and durable foam base for long-term support.
What Makes The One Different?

Casper designed The One to prove that sleep science and affordability aren't mutually exclusive. Rather than cutting corners to hit a lower price point, The One is engineered with the same design principles behind Casper's more premium mattresses --- delivering meaningful comfort features in a streamlined, all-foam format that genuinely performs.

  • 90-Night Sleep Trial: The One comes backed by Casper's 90-Night Sleep Trial, giving you three full months to decide if it's the right mattress for you --- with a hassle-free return if it isn't.
  • Casper's Signature Foam Engineering: Built using Casper's established foam-layering approach, The One benefits from years of sleep research and material refinement --- giving shoppers access to proven construction at an accessible price.
  • Designed and Assembled in America: Like all Casper mattresses, The One is designed and assembled in the United States, reflecting Casper's commitment to quality control and domestic craftsmanship.
  • 10-Year Limited Warranty: The One is protected by a 10-year limited manufacturer warranty, ensuring your investment in better sleep is covered for the long haul.
Product Height
12 Inches
Product Width
38 Inches
Product Depth
75 Inches
Product Weight (lbs.)
48 Lb(s)
Collection
The One
Series
Not Applicable
Type
All Foam
Size
Twin
Coil Type
Coil Type Not Available
Coil Count
-
Comfort Level
Medium
Comfort Number
3
Construction
Tight Top
Edge Support
Yes
Cooling Technology
No
Hypoallergenic
Yes
Removable Cover
Yes
Adjustable Base Compatible
Yes
Additional Features
As comfortable as it is affordable. Our all-in-one solution for better sleep. Signature all foam mattress designed with a responsive yet supportive medium-firm feel is perfect for any sleep style.
Motion Isolation
-
Warranty Terms - Parts
120 Month(s)
Warranty Terms - Labor
120 Month(s)
Rated 5 out of 5 by from Very happy Very happy
Date published: 2026-04-28
Rated 5 out of 5 by from Love the bed! Love the bed!
Date published: 2026-04-28
Rated 5 out of 5 by from Such amazing comfort!! And service Such amazing comfort!! And service too. Thank you!!
Date published: 2026-04-27
Rated 5 out of 5 by from This is a great mattress. This is a great mattress. Firm and soft and comfortable.
Date published: 2026-04-26
Rated 5 out of 5 by from Perfect mattress! Incredibly soft yet Perfect mattress! Incredibly soft yet firm.
Date published: 2026-04-25
Rated 5 out of 5 by from To soft on the side To soft on the side where I sleep I can move over to the middle and it’s fine, maybe a defect in the foam.
Date published: 2026-04-24
Rated 5 out of 5 by from Happy with purchase. Happy with purchase.
Date published: 2026-04-24
Rated 5 out of 5 by from Last minute buy before store closed this was an emergency purchase 10 minutes before store closed the agent came thru and gave a free pillow
Date published: 2026-04-23
Rated 5 out of 5 by from Very comfortable mattress. I would Very comfortable mattress. I would highly recommend it.
Date published: 2026-04-21
Rated 5 out of 5 by from Took over 2 weeks to Took over 2 weeks to off gas but since then it has been great Super comfortable and supportive.
Date published: 2026-04-21
Rated 5 out of 5 by from Perfect for me! Exact fit Perfect for me! Exact fit for my Murphy Bed frame. Couldn’t be happier
Date published: 2026-04-21
Rated 5 out of 5 by from So far so good. So far so good.
Date published: 2026-04-21
Rated 5 out of 5 by from So far, so great! We are very happy with our mattress. We have had it a couple of months and it is sturdy and comfortable!
Date published: 2026-04-20
Rated 5 out of 5 by from Absolutely love it Absolutely love it
Date published: 2026-04-20
Rated 5 out of 5 by from The mattress is comfortable. My The mattress is comfortable. My wife and I are happy with our purchase.
Date published: 2026-04-20
Rated 5 out of 5 by from Great mattress! Great mattress!
Date published: 2026-04-20
Rated 5 out of 5 by from It was my second Casper It was my second Casper purchase. It was easy to assemble and so comfortable.
Date published: 2026-04-19
Rated 5 out of 5 by from I absolutely love my mattress. I absolutely love my mattress.
Date published: 2026-04-17
Rated 5 out of 5 by from Comfortable and my aches and Comfortable and my aches and pains have disappeared since getting The One mattress. Love it!
Date published: 2026-04-17
Rated 5 out of 5 by from Getting a good nights sleep Getting a good nights sleep with no aches or pains.
Date published: 2026-04-17
Rated 5 out of 5 by from This is my second purchase This is my second purchase I now have this comfort in every room. Best mattress by far
Date published: 2026-04-15
Rated 5 out of 5 by from Great mattress! I sleep like Great mattress! I sleep like a baby
Date published: 2026-04-07
Rated 5 out of 5 by from I love my new mattress I love my new mattress no more back pain.
Date published: 2026-04-06
Rated 5 out of 5 by from Nice improvement to the Cloud Nice improvement to the Cloud with the edge and slightly softer.
Date published: 2026-04-06
Rated 5 out of 5 by from Awesome Awesome
Date published: 2026-04-02
Rated 5 out of 5 by from Awesome mattress Awesome mattress
Date published: 2026-04-02
Rated 5 out of 5 by from Repeat buyer Purchased a second The One mattress for guest room. Love it just the same! Comfortable from day one. The first purchase (for a different bedroom) is just as comfortable as when it was new. Highly recommend!
Date published: 2026-03-31
Rated 5 out of 5 by from Best money I have ever Best money I have ever spent on anything. Comfortable and quiet. I am sleeping through the night again.
Date published: 2026-03-31
Rated 5 out of 5 by from Bed is very comfortable! Bed is very comfortable!
Date published: 2026-03-30
Rated 5 out of 5 by from I got this mattress for I got this mattress for my birthday. It's the most comfortable mattress I've ever slept on. So glad I decided to get it!
Date published: 2026-03-29
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