An airbag assembly for disposition proximate a roof of a vehicle to shield a vehicle occupant from impacting at least one lateral surface of the vehicle, the airbag assembly comprising: an inflatable curtain airbag having a stowed configuration proximate the roof of the vehicle and a deployed configuration into which the inflatable curtain airbag deploys downward between the vehicle occupant and the at least one lateral surface of the vehicle, the inflatable curtain airbag comprising: a first protection zone comprising a first interior chamber; a second protection zone comprising a second interior chamber in fluid communication with the first interior chamber; a restraint member secured to the second protection zone; and a plurality of mounting assemblies distributed along a length of the inflatable curtain airbag to facilitate attachment of the inflatable curtain airbag to the vehicle, characterized in that, in the stowed configuration, the inflatable curtain airbag is folded at a stowed fold line such that the second protection zone overlies a portion of the first protection zone; wherein, during deployment, the inflatable curtain airbag unfolds such that the second protection zone moves forward to be positioned forward of the first protection zone in the deployed configuration, the restraint member restricts outboard motion of the second protection zone in the deployed configuration to resist motion of the second protection zone to a position parallel to the first protection zone, the airbag assembly further comprises a forward tether comprising a first end secured to the inflatable curtain airbag and a second end securable to an A-pillar of the vehicle and in the stowed configuration, all of the plurality of mounting assemblies are positioned rearward of the A-pillar so that the second end of the forward tether is the only feature of the airbag assembly that is secured to the A-pillar. an inflatable curtain airbag having a stowed configuration proximate the roof of the vehicle and a deployed configuration into which the inflatable curtain airbag deploys downward between the vehicle occupant and the at least one lateral surface of the vehicle, the inflatable curtain airbag comprising: a first protection zone comprising a first interior chamber; a second protection zone comprising a second interior chamber in fluid communication with the first interior chamber; a restraint member secured to the second protection zone; and a plurality of mounting assemblies distributed along a length of the inflatable curtain airbag to facilitate attachment of the inflatable curtain airbag to the vehicle, characterized in that, in the stowed configuration, the inflatable curtain airbag is folded at a stowed fold line such that the second protection zone overlies a portion of the first protection zone; wherein, during deployment, the inflatable curtain airbag unfolds such that the second protection zone moves forward to be positioned forward of the first protection zone in the deployed configuration, the restraint member restricts outboard motion of the second protection zone in the deployed configuration to resist motion of the second protection zone to a position parallel to the first protection zone, the airbag assembly further comprises a forward tether comprising a first end secured to the inflatable curtain airbag and a second end securable to an A-pillar of the vehicle and in the stowed configuration, all of the plurality of mounting assemblies are positioned rearward of the A-pillar so that the second end of the forward tether is the only feature of the airbag assembly that is secured to the A-pillar. a first protection zone comprising a first interior chamber; a second protection zone comprising a second interior chamber in fluid communication with the first interior chamber; a restraint member secured to the second protection zone; and a plurality of mounting assemblies distributed along a length of the inflatable curtain airbag to facilitate attachment of the inflatable curtain airbag to the vehicle, characterized in that, in the stowed configuration, the inflatable curtain airbag is folded at a stowed fold line such that the second protection zone overlies a portion of the first protection zone; wherein, during deployment, the inflatable curtain airbag unfolds such that the second protection zone moves forward to be positioned forward of the first protection zone in the deployed configuration, the restraint member restricts outboard motion of the second protection zone in the deployed configuration to resist motion of the second protection zone to a position parallel to the first protection zone, the airbag assembly further comprises a forward tether comprising a first end secured to the inflatable curtain airbag and a second end securable to an A-pillar of the vehicle and in the stowed configuration, all of the plurality of mounting assemblies are positioned rearward of the A-pillar so that the second end of the forward tether is the only feature of the airbag assembly that is secured to the A-pillar.