Inflatable frontal restraint air cushions, or frontal curtain airbags, are disclosed herein. An occupant impact zone is formed by an opening at an inner area of the frontal restraint air cushion extending from a rearward surface to a forward surface, the opening defining a free end of the occupant impact zone and a fixed end of the occupant impact zone such that the free end is pivotable relative to the fixed end. The occupant impact zone is to deflect forward with impact of the head of the vehicle occupant.