This Stetbury Hybrid mattress Set by Sealy Premium features the SealyCool fabric technology that absorbs, stores and releases heat for optimum climate control, an ultra-stretch Premium cover designed to stretch around your body four ways and recover quickly for maximum conformance, a layer of SealyEnvelop memory foam to offer a slower response and an open cell structure for a more breathable and comfortable sleep surface, DuraFlex coil edge, and the zoned Pocket Coils for more targeted support and to reduce motion transfer. This mattress will bring all the support and comfort you need to get a goodnight sleep. Includes a 9" Black base.