No power required: The P-CM coolant provides continuous cooling without electricity and automatically freezes at ambient temperatures below 28 C to maximize relief. Heat stress relief: Delivers immediate cooling and helps prevent heat-related fatigue or damage. Keeps you mentally alert and supports performance in hot environments. Frostbite prevention: The ice bag hat insert made from soft TPU provides a comfortable, secure fit for an irritation-free, skin-friendly experience while minimizing frostbite risk. Secure fit: A stable buckle ensures a secure fit on the head and prevents slipping. Suitable for sports or demanding work, offering strong hold and all-day comfort. Key attributes - Function: Cooling head insert for continuous relief without external power - Compatibility: Designed as an ice bag hat insert - Material: Soft TPU - Performance: Non-electric cooling with automatic freezing behavior at low ambient temperatures - Fit: Secure, slip-resistant with a stable buckle for all-day wear Use scenarios - Outdoor sports and workouts in hot weather, such as running, cycling, or training sessions - Manual labor in hot environments like warehouses, construction sites, or outdoor jobs - Long outdoor events, festivals, or travel where sustained cooling and comfort are needed