Arai Tour x4
 

I'm considering buying one of these, and see that it has a 'chin curtain' to reduce colder air (the front of the helmet being much more open).

I was wondering if anyone had any experience of these and whether they actually reduced the colder air, or is it just a gimmick? I would use the helmet all year round, and don't want to freeze in winter!

Thanks in advance.

Had them on different helmets and they do work. just keeps the wind off your chin really