The car door visors allow the windows of the car to be kept open in the event of light rain so that you can enjoy the rains as well as ensure that the car wind shields do not fog up due to the humidity. The car door visors also act as sun blockers from the side of the vehicle which can be uncomfortable to the driver or the passengers. Car door visors also act as wind deflectors and reduce the wind noise inside the cabin, especially at high speeds. The door visors also improve the aerodynamic stance of the car and provide an aesthetic appeal.