The Comfort Solutions Signature Collection 25/90 is the solution to all your sleep problems. Designed using data from the exclusive Comfort Solutions Lab®, this mattress features a stable and durable support capsule comprised of edge-to-edge pocket spring units. These ensure that you have maximum sleeping space and support. Sitting delicately on top of the support capsule is a removable Pure Foam comfort capsule with our signature non-slip closure. This allows for easy and quick removal and rotation for even wear and replacement when needed. Reinforced on the edges, this mattress will not sag when you sit on the edge.