Cooling pillows are often infused with materials like gel, graphite, or copper that help draw heat away from your body. Certain models combine these elements with a construction that promotes airflow so that heat can escape. Cover fabrics like cotton, rayon derived from bamboo, and wool are beneficial too since they wick sweat and increase breathability.
Your pillow’s shape can also have an effect on how cool it feels. A solid piece of foam will generally retain more heat than it will when the foam is shredded, as air can better circulate around the shredded fill. Consider your sleeper type and fill preferences to find a cooling pillow that has all the qualities you need.