Water-Cooled Comfort: The CoolEase Pillow Insert incorporates a unique, integrated water system that absorbs and disperses heat, maintaining an optimal temperature throughout the night. Simply fill the insert with water. Customizable Cooling: Adjust the amount of water in the insert to control the level of cooling. Whether you prefer a light, cool touch or a more intense chill. Soft & Supportive: Designed to fit seamlessly into your existing pillow, the CoolEase insert adds a layer of softness while providing excellent head and neck support. Eco-Friendly & Reusable: The CoolEase is designed with sustainability in mind, featuring a reusable water system that doesn't require electricity or refrigerationjust a quick water refill, and you're ready to go. How it Works: The CoolEase Pillow Insert uses an innovative cooling membrane that channels water within the insert.