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Deal.ai › Casper
Casper
Casper One 11" Medium Mattress CA King

Casper One 11" Medium Mattress CA King

4.4(1,600 ratings)

Best price now

$1,149.00at Relax The BackObserved at 5:53 AM
Deal: 30% off at Relax The Back →

Compared across 3 stores. Prices are checked against each store and labelled with when.

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Price facts

  • Lowest price today: $1,149.00 at Relax The Back (checked Nov 9, 2026).
  • Checked at 3 stores.

Our take on the Casper One 11" Medium Mattress CA King

The Casper One is Casper's streamlined all-foam mattress, sold in one firmness (medium) and one height (11 inches). It uses a breathable polyurethane foam top layer over a support core, with a knit cover and handles on the sides. It suits side and back sleepers of average weight who want a simple, well-known foam bed without a premium price tag. Compared with Casper's multi-layer hybrids, it has fewer layers and no coils, so it isolates motion well but feels less springy and sleeps warmer than a hybrid.

Best forSide and back sleepers of average weightCouples who want motion isolationGuest rooms and first apartmentsShoppers who want a simple all-foam bed
Pros
  • One firmness and one height keeps the choice simple
  • All-foam build absorbs motion, so a partner's tossing is less noticeable
  • Medium feel works for a wide range of sleepers
  • Ships rolled and compressed, easy to move into tight rooms
  • Side handles make rotating the mattress easier
Cons
  • No coil layer, so it feels less responsive than a hybrid
  • Foam sleeps warmer than spring or hybrid beds
  • Not firm enough for some heavier back and stomach sleepers
  • Edge support is softer than on a hybrid

Casper One 11" Medium Mattress CA King prices at every store

  • Relax The BackNew

    In stock

    $1,149.00Observed at 5:53 AM
    Visit Relax The Back
  • The Home DepotNew

    In stock

    $1,195.00Free shippingObserved at 5:53 AM
    Visit The Home Depot
  • TargetNew

    In stock

    $1,195.00Free shippingObserved at 5:53 AM
    Visit Target

Store links may earn us a commission. Some prices via Klarna.

Casper One 11" Medium Mattress CA King price history

$1,149.00$1,149.00
Nov 1Nov 9

Lowest price we've seen: $1,149.00 on Nov 1 at Relax The Back. Tracked across 3 stores since Nov 1.

What reviewers say

  • 4.4 / 51,600 ratings

Owners rate the Casper One well overall, calling it comfortable and easy to set up. Complaints center on heat retention and on the mattress softening sooner than expected for some sleepers.

What people mention
  • ComfortPraisedMost owners describe the medium feel as comfortable for side and back sleeping.
  • HeatCriticisedSome sleepers say the foam traps heat and they wake warm.
  • DurabilityMixedA number of owners report the foam softening or developing dips within a few years, while others see no change.
  • SetupPraisedBuyers say it unrolls and expands quickly with little odor.
  • Edge supportCriticisedSitting or sleeping near the edge feels softer than on a coil mattress.

Questions and answers

Is the Casper One good for side sleepers?
Yes. The medium foam gives enough give at the shoulder and hip for most average-weight side sleepers. Heavier side sleepers may want a softer or thicker model.
Does the Casper One need a box spring?
No. It works on a slatted frame, platform bed or adjustable base. A solid or slatted foundation with good airflow is best; avoid a sagging old box spring.
How does it compare with the Casper Original Hybrid?
The One is all foam with fewer layers and no coils. The hybrid adds springs for more bounce and better edge support, at a higher price.
Is the Casper One good for couples?
Yes. The foam absorbs motion, so one partner moving disturbs the other less. It sleeps warmer than a hybrid, which matters if either of you runs hot.
What sizes does the Casper One come in?
It comes in the standard sizes from twin through California king, all at 11 inches tall and medium firmness.
Where is the Casper One 11" Medium Mattress CA King cheapest?
At Relax The Back, for $1,149.00, 30% off, as of our latest check.
What do buyers say about the Casper One 11" Medium Mattress CA King?
Rated 4.4 out of 5 from 1,600 ratings.
Where can I buy the Casper One 11" Medium Mattress CA King?
3 stores we checked sell it, including The Home Depot, Target, Relax The Back.

Stores we've priced the Casper One 11" Medium Mattress CA King at

  • Home Depot deals and prices
  • Relax The Back deals and prices
  • Target deals and prices

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