Mercedes and Nico Rosberg have been putting out a pretty interesting series of videos detailing some of the systems used in Formula 1 racing. This episode deals with the Head and Neck Support (HANS) system. The back of the driver’s helmet is strapped to a chest brace that is held in with the safety harness. In the event of a crash, the force that would whiplash the head forward is transferred to the chest greatly reducing the amount of hyper-extension the neck sees. Simple and effective.