Man-Mounted Cooling System uses miniature compressor to cool the water as coolant, then pumped the coolant throughout tube vest which end user will wear, absorbing hear from human body. It delivers over 150W cooling and works well at ambient temperature 104℉, gives end users a dramatic increase of endurance time and maintain focus in heat conditions, ideally suited for single user. Meanwhile, backpack with battery power supply design is easy to carry and don.