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This hour's deals
Casper
Casper Slate Firm Mattress 10.5
−53%
Home · Mancini's Sleepworld

Casper firm mattress for deeper sleep

Casper Slate Firm Mattress 10.5

The Casper Slate firm mattress delivers supportive comfort for back and stomach sleepers.

Deal score 7.4 · Great deal
$395.00$839.00 Mancini's Sleepworld's regular price

You save $444.00 at Mancini's Sleepworld

Checking it's still available…

Why it's a great deal

  • Mancini's Sleepworld lists its regular price at $839.00: 53% off by its own figures
Visit Mancini's Sleepworld

Every store we checked

  • Mancini's SleepworldNew

    In stock

    $395.00Observed at 6:37 PM
    Visit Mancini's Sleepworld
  • Christian's Mattress XpressNew

    In stock

    $595.00Observed at 6:37 PM
    Visit Christian's Mattress Xpress
  • JCPenneyNew

    In stock

    $995.00Free shippingObserved at 6:38 PM
    Visit JCPenney
  • PC Richard & SonNew

    Out of stock

    $561.97Observed at 6:37 PM
    Visit PC Richard & Son
  • WalmartNew

    Out of stockSold by Casper Sleep Inc.

    $845.00Observed at 6:37 PM
    Visit Walmart

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

Price history and every store's price →

Reading Mancini's Sleepworld’s product page for the details…

Specs

Firmness Level
Medium-firm
Mattress Type
Memory Foam
Type
Mattress
Length
80 in
Width
38 in
Certifications
Certipur-Us Certified
Core Material
Foam
Cover Material
Soft-knit cover
Material
Foam
Foundation Type
Adjustable Base

About the Casper Slate Firm Mattress 10.5

The Casper Slate is a memory foam mattress in a box with a medium-firm feel and a tight top. It pairs a pressure-relieving memory foam layer with a soft-knit cover and cooling design meant to limit heat buildup, and it is CertiPUR-US certified. The lowest recent price was $395 on November 4, against a high of $695 on November 3, so the current spread is wide and worth watching. It ships compressed in a box and works on an adjustable base, which is not included.

Best forBack and stomach sleepers who want a firmer feelHot sleepers looking for a cooling foam mattressShoppers who want a bed in a box at a low priceGuest rooms and adjustable-base setups
Pros
  • Medium-firm support suits back and stomach sleepers
  • Memory foam layer relieves pressure at hips and shoulders
  • Cooling design targets overheating
  • CertiPUR-US certified foam
  • Ships compressed in a box for easy setup
  • Works with an adjustable base
Cons

More deals like this

  • All Casper deals and products
  • All Mancini's Sleepworld deals and prices
  • All JCPenney deals and prices
  • All PC Richard deals and prices
  • Early Black Friday Mattress Deals 2026

Price facts

  • Lowest price today: $395.00 at Mancini's Sleepworld (checked Nov 8, 2026).
  • It's down $200.00 from $595.00 a week ago.
  • Checked at 5 stores.

Ask our agent about this deal

It checks today's price at every store, compares the alternatives and answers in about a minute.

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  • Too firm for many side sleepers
  • All-foam build can feel less springy than hybrid mattresses
  • Foundation and adjustable base sold separately
  • Spot clean only, no removable washable cover
  • Edge support is limited on foam-only designs

What reviewers say

Owner feedback on the Slate line is generally positive on firmness and value, with side sleepers often finding it too firm. Complaints center on heat retention and weak edge support.

What people mention
  • FirmnessMixedBack and stomach sleepers like the support, while side sleepers often find it too firm.
  • CoolingMixedThe cooling design helps some sleepers, but others still report sleeping warm.
  • ValuePraisedOwners see it as a solid memory foam mattress for the price.
  • Edge supportCriticisedThe foam edges compress more than owners expect.
  • SetupPraisedIt expands quickly and is easy to unbox.

Questions and answers

Is the Casper Slate Firm good for side sleepers?
It is medium-firm, so many side sleepers find it too firm and prefer a softer model. Back and stomach sleepers usually do better on it.
Does the Casper Slate sleep cool?
It has a cooling memory foam layer, but some owners still report sleeping warm. Hot sleepers should weigh that against the low price.
What sizes does the Casper Slate come in?
It is sold in standard sizes from twin to king, including twin XL. Check the size before ordering, since prices vary by size.
Do I need a box spring for the Casper Slate?
No. It works on a flat foundation, slatted frame or adjustable base, which is sold separately.
When is the Casper Slate cheapest?
Its recent low was $395 on November 4, well below the $695 high on November 3. Watch for sales around holidays and mattress events.
Is the Casper Slate mattress in a box?
Yes. It ships compressed and rolls out to full size within about a day.

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