The Belgravia Gel Hybrid MediumThe middle of our three Gel Hybrid mattresses. The tension most sleepers want, with the cool sleeping surface only gel can give. Gel hybrid is what we'd recommend to anyone who runs warm at night, has tried memory foam and found it claustrophobic, or sleeps next to a partner who heats up the bed. The gel infused foam comfort layer draws heat away from the body and disperses it, so the surface stays cool through the night rather than warming up the way