"The most advanced pillow-cooling technology available, Omniphase® phase change material provides continual temperature regulation with ventilation for superior airflow. Phase change molecules capture and release heat as needed to maintain the optimum sleep temperature throughout the night. To further the cooling properties, activated carbon infused in the foam creates a pathway to filter heat away from the head, face, and neck. Now you can enjoy the pressure-relieving benefits of memory foam while sleeping at the perfect temperature. Lastly, a TENCEL™ mesh cover creates a soft, smooth surface that helps control humidity while allowing maximum exposure to the Omniphase® coating.