What is the purpose of the sponge inside the fender?

[LeIris]

The purpose of the sponge inside the fender is to absorb moisture expelled from the interior of the car, which is then evaporated. Below is an introduction to the car fender: 1. Definition: The fender, also known as the wing panel, is the outer body panel that covers the wheels. Depending on the installation position, it is divided into the front fender and the rear fender. 2. Function: Utilizing fluid dynamics, it reduces the drag coefficient, making the car drive more smoothly. The front fender is installed at the front wheel, and because the front wheel has a steering function, it must ensure the maximum limit space when the front wheel turns. Therefore, designers use the "wheel jump diagram" to verify the design dimensions of the fender based on the selected tire model size. The rear fender does not have the problem of wheel rotation rubbing, but for aerodynamic considerations, the rear fender is slightly arched outward.