Best Cooling Gel Mattress Toppers: Ice-cooled gel memory foam mattress toppers are made with a gel-injected material to assist in temperature regulation and heat dissipation. They are intended to give a cosy, cool sleeping surface. The best ice-cooled gel memory foam mattress toppers relieve pressure points, efficiently cool the body as you sleep, and improve overall comfort. It normally has a percolating cover and a layer of cooling foam or gel beads molded to the body shape, providing excellent support and temperature regulation.