The Casper Original mattress is generally considered to be the flagship model of the Casper brand. It features a four-layer foam construction, including a top layer of breathable open-cell foam and a layer of zoned support foam that is designed to provide targeted pressure relief in different areas of the body. The Casper Essential, on the other hand, has a simpler three-layer foam design, with a top layer of responsive memory foam and a bottom layer of supportive base foam.