The pembroke rona part of the enchanted collection a collection which uses sweet dreams own unique sleepzone spring system the sleepzone spring system is a purpose designed spring system for developed for sleeping comfort with twice as many springs as a traditional bonnell unit creating a blissful sleep that is truly enchantedconjuring extra softnesspillowtop for an extra soft layer of enchantmentexclusive sleepzone springsknitted mattress cover with modern fabric bordervertical stitched bo