Dual shield motorcycle helmets are the newest craze to sweep motorcycle safety gear. Dual visor helmets are most often seen as full face helmet models. These full face helmets have the normal visor attached to the outside of the helmet, but also have an additional visor that is inside the helmet. This is what gives dual visor helmets their name.
The outer visor, or sheild, of a dual visor motorcycle helmet is usually clear. While this outer visor can raise and lower, it is often left clear so that the motorcyclist can operate the motorcycle safely at night and in low-light situations while still gaining the benefits of a full face helmet, like eye protection and decreased wind resistance. The inner visor of a dual shield motorcycle helmet is often tinted. This tinted second visor is usually retractable - the visor can be raised or lowered inside the top of the helmet. When lowered, it protects the eyes from the sun, but can be raised out of the way when not in use.
All dual shield motorcycle helmets still adhere to DOT and/or SNELL safety requirements. Headcase is a popular manufacturer of dual visor helmets, as are Scorpion, Arai, HJC, Shoei and Bell.