Royal Comfort Comforpedic Bonnell Spring Mattress - SingleDESCRIPTIONUnwind 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 customised and relaxing sleep surface,