High temperatures in the summer can cause a lot of problems, including heat strokes; also, summer heat causes serious symptoms to people with multiple sclerosis and there is not any medication available regarding these symptoms.
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A cooling jacket filled with PCMs can be used to solve this kind of problems, so when the body temperature goes high, PCMs absorb the heat and change phase to liquid making people enjoy a fresh feeling during the summer.
Another use of these jackets is for firefighters who work at environments with very high temperatures, improving their work conditions thanks to their use.