Like sleeping on air: when it comes to lying comfort and quality, the EVOLUTION box spring bed leaves nothing to be desired. Box spring refers to a multi-stage lying system: the base suspension at the bottom provides the maximum suspension comfort with its Bonnell, pocket or micro pocket spring core. On top of that is a comfortable pocket spring core mattress that provides effective relief for the back. The top layer consists of the topper. We need a good night's sleep for the best possible start to the day. Nothing beats trying it!