The relyon memory origional mattress is made from 30mm memory foam and 150mm superflex foam these guarantee to provide comfort and support with pressure relieving properties contouring to your body shape it has a coolmax quilted cover for added comfort and helping to keep your cool during the nightthis incredible mattress has a 150mm superflex foam core with a 30mm memory foam topper these work together to give unbeatable support to all the important parts of your body including the neck spine