Twin Full Queen King Size Mattress in a Box Hybrid Spring Memory FoamResponsive Multiple Layers: Constructed with pocket spring,cooling Gel Infused memory foam and high resilience egg crate foam. The memory foam provide pressure relief to keep you comfortable through the night. The high quality pocketed coils form a stable support system that gives you the best support your body needs. Relax your spine, hips, shoulders, and lower back for any sleep position Disturbance Free sleep with stable support: Memory foam