Plenty Of helmets have the ability to tighten behind the head (this is recognized as the rear or occipital fastener/stabiliser). The adjustable mechanisms used for tightening will differ among helmets. The second connecting member forty five proven in FIGS. six and 7 is linked to a third connecting member (not https://gunnergusha.blogunok.com/41752933/the-fact-about-how-to-choose-the-right-helmet-for-bike-riding-that-no-one-is-suggesting