How can I keep cool on a foam mattress?

To sleep cooler on a foam mattress, use breathable, natural-fiber sheets and bedding, maintain a comfortable room temperature, and make sure there is airflow around and under the bed. If you're a hot sleeper, look for foam models with cooling features such as gel-infused or ventilated foams and moisture-wicking covers and avoid overly thick, low-breathability toppers.