The all-new, enhanced Serta Perfect Sleeper mattress provides even better pressure-relieving comfort and support, while maintaining a balanced sleeping temperature to help promote undisturbed sleep. Inside the Perfect Sleeper. CoolFeel Fabric a luxurious, breathable cover with a coolto-the-touch sensation from technology that is plant-derived. HexCloud Gel Memory Foam Sertaâ€™s exclusive gel memory foam boasts unique geometric cut outs to deliver cool, contouring pressure relief for oh-sorelaxing sleep. 1000 Edition Custom Support Coil System Up to a cool grand of individually wrapped coils deliver unparalleled support and less motion transfer. On top of that, this edition features Sertaâ€™s BestEdge Foam Encasement technology â€“ an extra-deep foam rail to help reduce edge roll-off and extend the sleep surface.