原来头盔外面还有很多层透明的胶带，可以随时撕掉

The visor will be made of a special clear polycarbonate, combining excellent impact protection with flame resistance and excellent visibility. Most drivers use tinted visors, the insides of which are coated with anti-fogging chemicals to prevent them misting up, particularly in wet conditions. Several transparent tear-off strips are attached to the outside. As the visor picks up dirt during the course of the race, the driver can remove these to clear his vision.

http://www.formula1.com/inside_f1/safety/helmets/