Although memory foam mattresses have the ability to retain body heat more efficiently than standard mattresses due to their composition, Ergoflex memory foam mattresses have an open cell structure to allow air to circulate freely through their layers. Every Ergoflex 5G comes with a unique Cool-Sleep airflow layer to assist temperature regulation, and the all-new TENCEL outer cover is highly breathable with unrivalled moisture wicking attributes when compared to natural cotton or high-tech synthetic fabrics. We have also introduced our new TUNDRA thermoregulating protector, which uses advanced phase-change materials to create a comfortable sleeping temperature.