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13:37 GMT+7 The vest uses a phone's backup battery, so it can work for more than eight hours. In addition, users can add "coolant" by adding ice into the included water jug without taking off their vests. Looking at the pictures of doctors and nurses on the frontlines against the Covid-19 epidemic with blistered skin on their hands and bodies, and some even fainting due to overheating, a group of students from the Institute of Chemical Engineering (Hanoi University of Science and Technology) decided to design a cooling shirt weighing only about 1kg.