Comforpedic Mattress 5 Zone Medium Support Foam Bonnell Spring 21CM - King Single - White BlackUnwind and experience a rejuvenating nights' sleep with the Royal Comfort Comforpedic 5 Zone Mattress! The Comforpedic Mattress has been designed using traditional bonnell spring construction finished with several layers of high density foam. The unique 5 zone design of the mattress provides both pressure relief and support. The upper foam layers have been designed to adjust to the body and provide a customized and relaxing sleep surface, while the