Omniphase® phase change material from the advanced pillow-cooling technology provides continual temperature regulation with ventilation for superior airflow to the CarbonCool® + OmniPhase® LT Pillow. 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.