Many memory foam mattresses have an issue retaining body heat because memory foam is a dense material and lacks interconnected air channels. However, there are memory foam mattress options available that have gel or copper-infused memory foam or have added air channels to improve ventilation. The Snuggle-Pedic Deluxe Comfort memory foam mattress has a patented Airflow Transfer System and the Nectar Lush mattress has a Tencel Cooling Cover which promotes breathability and pulls heat away from the mattress.