Mil-TecFrench Army Tropical Pith Helmet in British Khaki

Since the description states it is made of a "light composite shell", does this mean this is not made from tree pith? In common words ""thin plastic"?

What materials make up the "Lightweight Composite Shell "?

Is there just a band around the circumfrance of the head or are there bands that go over the top of your head too helping to keep the airspace open?

Can i know the size