Kaymed Nirvana 1200 Mattress has the equivalent of 1200 pocketed springs in a king-size mattress. ThermaPhase TM Ultra is a unique pressure relieving material, infused with patented phasechange crystals, plus copper and precious metal microbeads. The phase-change crystals work by constantly absorbing and releasing body heat to maintain the ideal sleep surface temperature. The infusion of copper and precious metal microbeads work as a superfast heat conductor,quickly moving heat to and from the mattress surface as required. *Natural temperature regulation *1200 Pocketed Springs *Sleep both sides to extend mattress life and performance - please turn and rotate regularly Mattress Dimensions. *Single - 90cm w x 190cm lx 24cm d *Small Double - 120 w x 190 lx 24cm d *Double - 135cm w x 190cm lx 24cm d *King - 150cm w x 200cm lx 24cm d *Superking - 180cm w x 200cm lx 24cm d Important Information:. Please note that pocket sprung mattresses must not be used with a base for which they are not designed. Slats on a bed frame should be no less than 70mm apart, to ensure the mattress receives adequate support. Failure to use an adequate base could invalidate the warranty from the manufacturer. Please check with us for more details.. Please note this is Mattress only Lifestyle Image is for illustration purposes only..