The top layer of the mattress contains 7cm 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 which enables the mattress to breathe the bottom is a 13cm layer of firmer reflex foam used to provide additional support and giving the memory foam its natural orthopaedic propertiesa 3d mattress border and luxury coolsport mattress cover helps the mattress breathe and keep yo