The Olympic Games of 2020 in Tokyo are expected to be the most thermally challenging Games ever. It will probably be hot (35°C) and humid (70-80%) during the Olympics. To prepare the Dutch athletes optimally, TU Delft collaborates with several universities, sports federations and companies in the 'Thermo Tokyo' project. In this project, we aim to develop and evaluate ways to limit performance loss and safety hazards associated with exercise in a hot and humid environment. TU Delft is specifically involved in developing cooling solutions, like cooling garments and reflective materials.