The top layer of the mattress contains 10cm of temperature sensitive visco elastic memory foam the visco elastic provides comfort total body support and pressure relief the memory foam also has an open cell structure hich enables the mattress to breathe the bottom is a 10cm layer of firmer reflex foam used to provide additional support and giving the memory foam its natural orthopaedic properties a 3d mattress border and luxury coolsport mattress cover helps the mattress breathe and keep y