The Casper mattress unites materials in an entirely new way, and cuts out the most common pain points of the traditional foam mattress. Memory foam sleeps incredibly hot and has a surface that sinks too far in. Sleepers wake up feeling like they'll never be able to escape from their sweaty crater. We designed the Casper to sleep cool. The top layer of our mattress is open-cell foam, which is way more breathable and cooler than memory foam. Beneath the top layer is a proprietary memory foam. Based on our extensive research and testing in our laboratory, our memory foam is upwards of 20 times more breathable than most memory foam on the market. Additionally, hybridized foam construction doesn't tightly conform to you body, so air can circulate freely. Casper’s unique combination of foams sleeps cool, provides a healthy bounce, and promotes ideal anatomic support and ships directly to your door.