With an uber-soft surface and a firm base, this bonnell spring mattress matches support with comfort. The topmost layer of the mattress is soft and smooth pillow top, followed by an active NRG layer that distributes pressure evenly to the three zones of your body. Bonnell springs, which offer firm support, form the core of the mattress. Finally, anti-stress fabric boosts your quality of sleep by repelling negative ions. After a good night’s sleep on this mattress, you’ll wake up feeling refreshed.