Casper The One

A medium all-foam mattress from Casper, rated 6/10 for firmness. Scores highest for back sleepers: 81/100.

8/10 motion isolation

Manufacturer site · casper.com · not an affiliate link

Match Score

Strong match

Typical back sleeper, 160 lb · 14th of 26 ranked

Your weight, temperature and partner can move this a lot.

Firmness: Medium 6/10
Queen price: $899
Trial: 100 nights
Warranty: 10 years

Match Score

Scored for the way people sleep.

The same engine as the quiz, run for a typical sleeper in each position. Reference sleeper: 160 lb, sleeps neither hot nor cold, sleeps alone, no stated firmness preference. Only the sleep position changes.

Model v0.2. Rank is among the mattresses with enough data to rank, for that same sleeper, as on the category pages. How scores work

Get your full score

Side sleeper
77/100
Good match · 9th of 26 ranked for this sleeper
Good match for a side sleeper: strongest on pressure relief and support & alignment.
Back sleeper
81/100
Strong match · 14th of 26 ranked for this sleeper
Strong match for a back sleeper: strongest on support & alignment and pressure relief.
Stomach sleeper
78/100
Good match · 16th of 26 ranked for this sleeper
Good match for a stomach sleeper: strongest on support & alignment and pressure relief.
Combination sleeper
81/100
Strong match · 13th of 26 ranked for this sleeper
Strong match for a combination sleeper: strongest on support & alignment and pressure relief.

Inside

Inspect the mattress.

A typical all-foam build, layer by layer. Select a layer to see what it does, which parts of Casper's published materials list belong to it, and how that part of the bed scores.

Select a layer

Illustration of a typical all-foam build, not a teardown of the Casper The One.

Layer 01 of 04

Cooling Cover

The fabric layer you lie on. It is often a quilted or knit panel; breathable weaves help move heat and moisture away from the body, which is one input to how warm a bed sleeps.

Mainly drives cooling.

From Casper's materials list

Cozy Cover (knit)

Matched to this layer by component name. Thicknesses and densities aren't published.

Performance · Typical back sleeper, 160 lb

Cooling70/100
Sourced · independent rating 7/10

Specifications

The specifications.

All 8 core specs on file

Source: Casper (opens in a new tab) — official product page, checked 25 Sep 2026.

Firmness: Medium 6/10; The number comes from a published independent review, not the brand's own page. Medium-firm, responsive and lively (manufacturer).
Construction: All-foam; 4 components listed by Casper. See them by layer above.
Height: 11 in
Queen price: $899; Checked 25 Sep 2026.
Trial: 100 nights; Free shipping and free returns. Returns can be initiated after the 30-night adjustment period.
Warranty: 10 years
Cooling: 7/10; Independent rating
Motion isolation: 8/10; Independent rating
Edge support: 6.5/10; Independent rating
Durability: 7/10; Independent rating

Independent notes

What reviewers noted.

Sources

Sleep Foundation (opens in a new tab)

Our paraphrase, not quotes. A listed source is evidence we checked, not an endorsement of this site.

Strengthmotion isolation
Absorbs motion rather than transferring it (rated 8/10).
Paraphrased from Sleep Foundation
Notedurability
Shouldn't expect too much longevity beyond the standard seven or so years (rated 7/10).
Paraphrased from Sleep Foundation