The bodyease electro relaxer mattress features over 500 individually pocketed springs to ensure a high quality and ultra comfortable nights sleep the surface tufting means that the hypoallergenic fillings are bound closely together and the nickel plated air vents work to ensure that the mattress is well insulated to keep you cool at night if you suffer from the likes of asthma this mattress is the perfect choiceplease note spring count refers to a 5ft kingsize model