Is the Casper Slate Firm good for side sleepers?

Mostly no. It is a firm all-foam bed, and side sleepers often need a softer surface to cushion the shoulder and hip. Back and stomach sleepers are the better fit.

Does it need a box spring?

No. It works on a flat foundation, slatted frame or adjustable base. A box spring is optional and not included.

How long does it take to expand?

It ships compressed in a box and usually reaches full shape within a day or two. Some corners may take longer.

Is it hot to sleep on?

It has a cooling top layer, but it is still memory foam. Hot sleepers and heavier owners report it can sleep warm.

How does it compare with the Casper Original?

The Slate is firmer and simpler, without the zoned support and thicker comfort layers of the Original. Choose the Slate for a flat, firm feel and the Original for more contouring.

Can it be used on an adjustable base?

Yes. The all-foam construction bends with an adjustable base.

All Travel Tech Clothes Shoes Jewelry Home Beauty Outdoors Toys

This hour's deals

−53%

Home · Mancini's Sleepworld

Casper Slate Firm 10.5" Mattress

Name: Casper Slate Firm 10.5" Mattress
Brand: Casper
Availability: InStock

Deal score 7.4 · Great deal

$395.00$839.00 Mancini's Sleepworld's regular price

You save $444.00 at Mancini's Sleepworld

Deal.ai's agents found this deal on November 9. The store may have changed its price since.

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 5:53 PM
Visit Mancini's Sleepworld
Christian's Mattress XpressNew
In stock
$595.00Observed at 5:53 PM
Visit Christian's Mattress Xpress
JCPenneyNew
In stock
$995.00Free shippingObserved at 5:54 PM
Visit JCPenney

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 10.5" Mattress

The Casper Slate Firm is an all-foam, medium-firm mattress sold as a tight-top bed in a box. It layers memory foam over a foam core with a soft-knit cover and a cooling top, aimed at back and stomach sleepers who want a flat, supportive surface. It sits below Casper's premium lines, so it skips the zoned support and thicker comfort layers of the Original and Dream models. Owners generally find it supportive and easy to set up, but some heavier sleepers say it feels thin and warm.

Best forBack and stomach sleepersShoppers who want a firm, flat foam bedGuest rooms and spare bedroomsPeople who want a bed shipped in a box

Pros

Firm, even surface that keeps the spine aligned
Memory foam relieves pressure at hips and shoulders
Cooling top layer helps with heat
Ships compressed in a box and expands quickly
CertiPUR-US certified foam

Cons

More deals like this

More from Casper