The paper, placed inside the shoes every night, will prevent them from becoming deformed or, if more paper than necessary is used, from coming off a little, spreading where the shoe could hurt.
In addition, paper has another function, which is to absorb moisture . Therefore, in the shoe rack, every time we take off our shoes, we have to place paper balls there, which will not only keep the shoes in shape but will also absorb their moisture, preventing the appearance of odor.
The paper should be put on the shoes even if the shoes have become very wet. Imagine an unexpected rainy day and your favorite sneakers, not suitable for getting wet, soaked. Luckily, if you put the paper inside, you can pick them up and let them dry overnight.