The silentnight 7 zone double memory rolled mattress supports you to the very edge of the mattress with no roll off the pressure relieving 3cm memory foam layer provides the mattress with a depth of 20cm teamed with the miratex foam to help absorb movement from both you and your partner so you dont roll together draped in a superior comfort soft touch knit cover the mattress offers 7 support zones to create extra comfort for a mediumfirm feel the zoned memory is hypoallergenic and dust mite