Made with PCM (Phase Change Material), it freezes naturally below approximately 28°C (82°F). It's not too cold like ice, providing a gentle coolness that comfortably cools your neck. It doesn't condense, so you don't have to worry about getting wet from water droplets. It can be refrozen not only in the refrigerator or freezer, but also with tap water, making it reusable and economical. Thank you for viewing.