The One is an all-memory foam mattress with a supportive medium-firm feel that's ideal for stomach and back sleepers alike.

Just be sure to use the right foundation for the bed. Otherwise, you could void your bed's warranty. It's interesting to see that Casper's top-tier bed is now a softer, dense memory foam option.

Learn more Casper has updated its entire mattress ... and remove your old mattress and foundation for a flat fee. But due to the novel coronavirus pandemic, the service is not available.

Casper beds are designed to work on a firm, solid surface. It's best to use a solid or slatted foundation, not a box spring.