Systems, methods, and other embodiments described herein relate to vehicle headliners. In one embodiment, a method includes detecting, with a controller connected to a first impact feature of a headliner of a vehicle, a physical contact with the first impact feature with the first impact feature having a first bending strength prior to the physical contact. The controller subsequently activates the first impact feature to transition the first impact feature from the first bending strength to a second bending strength in response to the detected physical contact.

The shock absorber includes: a base portion fixed to the attachment target; a shock absorbing portion having flexibility and attached to the base portion so as to be reversibly switchable between a housed state in which the shock absorbing portion is retracted toward the base portion and a protruding state in which the shock absorbing portion protrudes from the base portion; and a drive unit driving the shock absorbing portion to reversibly switch between the housed state and the protruding state. The drive unit, when operating the shock absorbing portion, at least switches the shock absorbing portion from the housed state to the protruding state.

An impact mitigation device includes: an impact absorber configured to transition from a folded state in which the impact absorber is folded to an expanded state in which the impact absorber is expanded; a first magnetic body provided on one end side of the impact absorber; a second magnetic body provided on another end side of the impact absorber and at a position facing the first magnetic body in the folded state; and a control unit connected to one of the first magnetic body and the second magnetic body, the control unit being configured to control the one magnetic body to generate a repulsive force between the one magnetic body and the other magnetic body.