Therma-Phase+™ is a high density visco-elastic material infused with unique phase-change gel crystals and a copper infusion. The high density visco-elastic provides your body with the optimum levels of comfort, support and pressure relief essential for a restful night’s sleep. The phase-change gel crystals work constantly to absorb, store and release your body heat to maintain the ideal sleep surface on the mattress. Mattress filling - 150mm Thermaphase+ material Guarantee - 5 year Mattress ticking type - knitted fabric. Mattress ticking composition - polyester/elastine. Firmness - medium firm. 30cm Deep All Foam Mattress Contains 150mm of Therma-Phase + material Single - 90cm (W) x 190cm (L) x 30cm (D) Double - 135cm(W) x 190cm (L) x 30cm (D) King - 150cm (W) x 200cm (L) x 30cm (D) Super King - 180cm (W) x 200cm (L) x 30cm (D) Mattress only supplied