Microclimate Cooling System(MCS) uses miniature compressor to cool the water as coolant, then pumped the coolant throughtout tube vest which end user will wear, absorbing heat from human boby, help user to against heat stress and maintain focus and increase mission endurance time in extreme heat conditions. It delivers over 360W cooling and works well at ambient temperature 120℉. MCS was specifically engineered for the cooling of Vehicle crew and Helicopter pilot which using vehicle power supply.