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Casper's The One mattress on a bed frame with a blanket and pillows on top in a bedroom setting. At the bottom of the image is the Consumer Reports logo. The One is the top-rated all-foam mattress of 2026. See below to learn more. Consumer Reports does not endorse products or service.
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92% of customers keep their mattress.*
A person's hand presses down to feel The One mattress. It is medium firm and feels responsive and lively.
A person lying on their side on The One mattress. Above the mattress is a list of its features: All-foam design has 3 layers of supportive, pressure-relieving foams. Breathable layers have open-cell foam to prevent overheating. Cozy engineering has wrapped the mattress in a soft-knit cover for extra coziness.
Graphic image labeling the layers of The One mattress. A breathable comfort layer helps you get cozy. Cradling memory foam keeps you aligned and asleep. A durable foam base stays supportive, year after year.
A couple lying on The One mattress tosses a pillow back and forth between themselves
Decade of durability, fiberglass-free, and designed and assembled in the USA.
Video of a couple carrying their new Casper mattress in its box up the stairs and setting it up in their bedroom
Select your foam model:
Casper

The One

BEST SELLER

Premium Foam Mattress

Sale price $699
SAVE 20%
Comp. Value: Regular price $874
Casper's The One mattress on a bed frame with a blanket and pillows on top in a bedroom setting. At the bottom of the image is the Consumer Reports logo. The One is the top-rated all-foam mattress of 2026. See below to learn more. Consumer Reports does not endorse products or service.
Blue icon of a ribbon with a star on a white background
92% of customers keep their mattress.*
A person's hand presses down to feel The One mattress. It is medium firm and feels responsive and lively.
A person lying on their side on The One mattress. Above the mattress is a list of its features: All-foam design has 3 layers of supportive, pressure-relieving foams. Breathable layers have open-cell foam to prevent overheating. Cozy engineering has wrapped the mattress in a soft-knit cover for extra coziness.
Graphic image labeling the layers of The One mattress. A breathable comfort layer helps you get cozy. Cradling memory foam keeps you aligned and asleep. A durable foam base stays supportive, year after year.
A couple lying on The One mattress tosses a pillow back and forth between themselves
Decade of durability, fiberglass-free, and designed and assembled in the USA.
Video of a couple carrying their new Casper mattress in its box up the stairs and setting it up in their bedroom
Cozy Cover

Cozy Cover

Breathable Foams

Breathable Foams

As comfortable as it is affordable.

Expertly engineered to solve your sleep needs without breaking the bank, our signature foam mattress features three layers of cradling foam and a responsive yet supportive medium-firm feel sleepers love.

Select your foam model:
Size Guide

Which mattress size is right for you?

When picking your next mattress, it’s more than just personal preference—two key things to keep in mind are how much room you have and who’s sleeping in the bed.

King Dimensions 76"x80", California King Dimensions 72"x84"

Upgrading to a King mattress is a game-changer if you’re sharing space with kids or pets. And if you’re tall, the extra length of a California King could be just right.

Full Dimensions 53"x75", Queen Dimensions 60"x80"

A Full size mattress is ideal for young adults or those with a smaller bedroom, while a Queen is the top pick for couples or anyone who enjoys extra space to sprawl out.

Twin Dimensions 38"x75", Twin XL Dimensions 38"x80"

The Twin is the smallest option, ideal for single sleepers. While the Twin XL is a dorm favorite it can also create a Split King if you purchase two.

Which pillow size is right for you?

Standard vs King Pillow Sizing
Pillow sizes can vary, but standard pillows, also known as queen pillows, are typically suitable for all types of sleepers. If you prefer extra space or need to fill the width of a larger mattress, king-size pillows, which are about 30% larger, are a great choice.
Select your size:
Complete your bed: What is Comp. Value?
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Subtotal: Sale price $699
SAVE 20%
Comp. Value: Regular price $874
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Free, no-contact delivery
100-night risk-free trial*
10-year limited warranty*
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Size
Sale price $699 Comp. Value: Regular price $874
Solid green background with white stars scattered throughout. Inside it appear the words Consumer Reports with its CR logo next to it.
Comfort You Can Count On

The One is Consumer Reports' top-rated all-foam Mattress of 2026.*

Read the report

*Consumer Reports does not endorse products or service.
Let's take a look under the covers.
Exploded view of the layers of The One mattress
Exploded view of the layers of The One mattress
Exploded view of the layers of The One mattress
Exploded view of the layers of The One mattress
Exploded view of the layers of The One mattress
If it's in a Casper mattress, it helps you sleep.

See the thoughtful engineering behind The One.

A Casper mattress in the manufacturing facility with a rolling machine on top to guarantee support
A Casper mattress in the manufacturing facility with a rolling machine on top to guarantee support
Decade of durability.

The Casper Core is engineered to support you night after night and year after year.

Get our best savings when you Build Your Own Bundle.

Even your bed needs a bed. Build your sleep setup from the ground up.

Stop-motion video of the Adjustable Base Max's top and bottom being adjusted to various angles. Enjoy endless cozy configurations for reading, relaxing, sleeping, or any bedroom activity.
Stop-motion video of the Adjustable Base Max's top and bottom being adjusted to various angles. Enjoy endless cozy configurations for reading, relaxing, sleeping, or any bedroom activity.
Adjustable Bed Frames
The ultimate sleep setup, with control at your fingertips.

Casper has three levels of Adjustable Bed Frames designed to work with any Casper mattress. You can use them on their own, on a Casper slatted frame, or inside your existing frame (just be sure to measure). Every base includes head and foot lift plus Zero Gravity mode, while Pro and Max feature upgraded lumbar support and more. This setup is perfect for sleepers who want full customization and ultimate relaxation (warning: there’s no going back).

Build Your Own Mattress Bundle Shop Adjustable Bed Frames

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BEST SELLER
The One

The One

Sale price $699
SAVE 20%
Comp. Value: Regular price $874
Shop The One
Cloud One

Cloud One

Sale price $899
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Comp. Value: Regular price $1,124
Shop Cloud One
Mattress Firmness
Medium-Firm
Firm Soft
Medium-Soft
Firm Soft
Ergonomic Support
Continuous Support Continuous Support Expertly engineered layers of foam that provide consistent support and long-term durability.
Continuous Support + Edge Support Continuous Support + Edge Support Expertly engineered layers of foam that provide consistent support edge-to-edge and long term durability.
Cooling & Breathability
Breathe Flex Foam Breathe Flex Foam A responsive and breathable open cell foam soothes you to sleep.
Breathe Flex Foam Breathe Flex Foam A responsive and breathable open cell foam soothes you to sleep.
Mattress Construction
11" Foam Mattress
11" Foam Mattress
Mattress Layers
4 Layers
4 Layers

Product specifications

Dream-Worthy Reviews

Real feedback from customers who have experienced the Casper difference.

Overall rating: 4.3954773 / 5 from 17910 reviews.

AI Generated Review Summary

The One mattress offers a luxurious and soft feel, providing great support and comfort. Customers appreciate its fast and efficient delivery, easy unboxing, and high-quality construction. While some users experienced back pain, others found relief from pain in their back, hips, and neck. Customer service is highly praised, though feedback on the smell is mixed.

Summary topics

  • Feel (6%): Customers expressed appreciation for the luxurious and soft feel of the Casper mattress, which was mentioned multiple times in the reviews.
  • Support (6%): Customers raved about the great support provided by Casper mattresses, praising their comfort and softness.
  • Delivery (5%): It was reported by customers that the delivery process was fast and efficient, with multiple mentions of quick delivery.
  • Unboxing (4%): It was observed by customers that the unboxing experience was easy and simple, with no tools needed.
  • Quality (3%): It was observed by customers that the quality of the product is consistently described as great, excellent, amazing, and high.

Review topics: [softness, installation, size, smell, instructions, replacement, frame, firmness, fit, weight, support, problem, comfort, assembly, quality, handles, material, delivery, design, mattress, customer service, looks, feel, sleep, cover, value, box, work, husband, style].

Review highlights

  • "Excellent mattress excellent sleep every single time Super soft yet very stable and balanced comfort and support." — Duc
  • "The shipment was fast; the unboxing and expansion of the mattress was surprisingly easy; all in all, a good experience." — Blake
  • "Love the mattress great quality great price great customer service" — Kara

Reviews

I have now purchase 3

"I have now purchase 3 "The One" mattresses in three different mattress sizes (twin, full, and queen). I'm a side sleeper and this style mattress really works for me. I have lower back and shoulder discomfort from arthritis and The One allows me to sleep through the night with the right amount of support and feel refreshed when I get up. Other mattresses that I'm exposed too from places like hotels or visiting family usually causes back or shoulder pain when I wake up. So I'm sold on The One mattress. It's worth giving it a try."

— Curtis S. (5/5)

Too Firm for Me

"The mattress seems well made but is way too firm for my 64 yr old body. Made my hips and legs hurt. I tried walking on it to soften it and slept on it each night for 6 weeks but it didn't seem to get any softer. I am returning it and have purchased the Cloud One. Hopefully it will be softer."

— Patricia M. (3/5)

Horrible chemical smell. I had

"Horrible chemical smell. I had two Casper mattresses before and always loved them but this new model is bad. It smells and gives me a headache and I am disappointed about the quality"

— Sandra S. (1/5)

I'm sorry but it causes

"I'm sorry but it causes my back to hurt really bad because it does not allow me to get in and out of bed easily. . Also, it doesn't allow me to turn over without hurting my back."

— Gary H. (2/5)

Very well constructed. High quality.

"Very well constructed. High quality. Does have a discoloration in the fabric on top right side. We are having a bit of discomfort sleeping . Aching shoulders and hips upon awakening. No cording on the sides to assist getting up (husband has had 9 prior back surgeries)"

— Ronald P. (5/5)

The mattress strikes a great

"The mattress strikes a great balance between comfort and support, and I’ve had consistently comfortable, restful nights of sleep since it arrived. It feels well made, offers good pressure relief without being too soft, and I’m waking up feeling refreshed. Looking forward to seeing how it performs over the long term, but I’m very happy with my purchase so far."

— Jeronimo G. (5/5)

So far, it’s nice. Although

"So far, it’s nice. Although I am still waking up with lower back pain, so I’m not quite sure whether I’m going to keep it or not. Still taking advantage of the trial."

— Melissa P. (4/5)

Horrible mattress, should not be

"Horrible mattress, should not be name the one. This mattress is hard. Dont not buy unless you like sleeping on the floor. Have not had a good night sleep since I bought it. Just returned it. Body aches and headaches. And it’s so so expensive. I will try dream and if it’s not giving I will buy somewhere else. Not happy."

— Mirian M. (1/5)

It’s my second Casper mattress.

"It’s my second Casper mattress. Great nice sleep with no pressure spots anywhere upon awakening"

— Diana H. (5/5)

Already has a dent in

"Already has a dent in the middle. Within a week. Was hoping it was just it settling in. But no. I'm actually rolling up to the side of the bed as opposed to tolling over. Need to obtain a replacement."

— myke d. (1/5)

Q&A

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Frequently asked questions

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Feel the difference in person. Try products for yourself and chat with a Sleep Specialist at a store near you.

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Our Sleep Specialists are dedicated to helping you find the mattress of your dreams. Give us a call or chat with us now.

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