The HANS has a tether with a metal clip that engages fasteners that are permanently attached to the helmets. Description may not be perfect. Keith Averill can fine tune it if he is looking here. He can also put the attachment parts on helmets if they are needed.
Joan Rivers response to Johnny Carson when Carson said don't you think men are looking for intelligence?
No man has every put his hand up a woman's dress looking for a library card.