Remember to blow dry your hair after washing it. Pinch the hair piece with the middle finger and forefinger, and blow it from the hair root to the hair tip with a hair dryer (the hair tip will turn yellow if it is not blown for too long). Repeat several times until it is 80% dry and a little fluffy.
If it will be deformed the next day, it is necessary to use a splint, preferably a ceramic surface, which is unlikely to dry the hair.