The Casper is an all-foam mattress built from a polyurethane base, a memory foam layer and a top layer of breathable open-cell foam. It is a medium-firm bed with a soft, contouring feel and a zoned support layer that is firmer under the hips and softer under the shoulders. It suits side and combination sleepers who want pressure relief without sinking deep into foam. Against rivals like Leesa and Tuft & Needle it is softer and more contouring, and owners often note that motion transfer is low but the edges give way.
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Owners generally praise the Casper for its soft-yet-supportive feel and low motion transfer. Complaints center on weak edge support and warmth, and a minority find it too soft for stomach sleeping.
The Casper California King Memory Foam Mattress is an all-foam bed with a zoned-support layer. This layer is designed to give targeted pressure relief to specific parts of the body.
It is built from four foam layers that add up to 12 inches of support. From top to bottom, they are breathable open-cell foam, high-density memory foam, zoned transition foam and durable support foam. All of the foam layers are CertiPUR-US certified, which means they aren't made with ozone-depleting chemicals.
The mattress is fully encased in a zip-off cover that is easy to remove for washing.
