As you ride your skateboard, you will be riding in one direction while the air/ wind brush in the opposite direction. In short, you will be going against the wind. The wind that hits on your face is what is referred to as airflow.
To minimize the effects of airflow and, in turn, maximize your visibility, it is often advisable that you buy helmets with visors. The TSG Pass Pro Skateboard Helmet reviews with Carbon Graphic Design is a good example.