Modular helmets in this category may have a flip-up or removable chin guard. In both cases they can have the approval like an open face J ECE 22-05 or they can have a double approval: P / J. In this case it can be used with the chin lowered or raised. The modular styles are mostly made from thermoplastic material but in some cases they are made from composite fibers and are very popular with touring motorcyclists, especially for their convenience and flexibility. Special Bluetooth headsets are available as an option for several models that are integrated into the helmet.