Cooling helmets typically utilize three main technologies: Evaporative Cooling, which uses specialized fabric liners that hold water and cool through evaporation; Phase Change Materials (PCM), which involve inserts that absorb body heat and maintain a constant temperature (usually around 18°C-24°C) for several hours; and Battery-Powered Fan Systems, which provide active airflow across the scalp. For high-heat environments like foundries, PCM inserts are preferred, while integrated fans are ideal for outdoor construction in humid climates.