Microclimate personal cooling system was designed to protect the crews in helicopter or vehicles under extremely high temperature. Assembled in Tank, Helicopter, Jet Fighter, Submarine, Naval Vessels, Race Cars, Army Corps, and Ambulance etc. all systems contain cooling unit and tube vests. Mini compressor in the cooling unit cools cycle water injects the cool water into tube vests, absorbing heat from the human body. When the water recycles, it provides sufficient cooling to maintain a constant body temperature, prevent or mitigate the heat stress in most extreme applications.