Natural cooling technology Uses P-CM as a natural coolant, requires no electricity, and automatically freezes at ambient temperatures below 28 C to provide a continuously refreshing feel. Cooling that enhances performance Improve physical and mental well-being with the hat ice pack insert. Stay comfortable in hot environments, avoid thermal injuries, and support performance with fast cooling and relief from summer discomfort. Cooling comfort Made from soft TPU material, the ice pack insert is skin friendly and non irritant, delivering a comfortable and safe experience while effectively preventing frost damage. Secure closure The hat insert with ice pack stays securely in place with a sturdy buckle, making it suitable for sport or work. Enjoy comfortable cooling during all activities. Use scenarios Outdoor exercise on hot days such as running, cycling, or hiking. Work in hot environments like construction sites, warehouses, or outdoor labor. Long study or work sessions in hot offices or studios requiring sustained cooling.