1500 Pocket Sprung System which work independently to react to your body’s movement & weight offending complete support.3D Spacer System Comprises of two outer textile substrates that are joined together & kept apart by an insert of spacer yarns creates a ventilated layer of air allowing heat & moisture to escape.FeaturesComfort Type - 1 side firm + 1 side soft.Luxury knitted fabric3D SpacerHypoallergenic fillingsSpinal SupportFoam encasedDouble Sided