The plastic fender under the car door is called a side skirt. Also known as lower beam or skirt. Because this part is made of plastic, it is easy to be scratched, so it is easily damaged. The side skirt is equivalent to an air dam, which is used to reduce the airflow on both sides of the car body into the bottom of the car. It has a certain turbulence effect and can obviously reduce the air resistance under certain conditions.

The side skirt is a part of the body spoiler kit, followed by beauty. If properly installed, it can reduce the reverse airflow generated when the vehicle is running.