Strong, durable, supportive. Decades of research and development have led to patented technology that instantly adjusts to your body providing superior all-over support, along with the comfort you need for a relaxing sleep. The CertiPUR-US® high density foams are healthier; they last longer and are more resistant to body impressions. The mattress features an integrated coil system designed to provide more push-back support the more pressure is applied, so your body can stay fully supported and properly aligned, all night long. Unicased edge support locks into the innerspring for a larger, more stable sleep surface that reduces motion transfer.