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 an inboard fabric layer and an outboard fabric layer that are secured together at a peripheral juncture to define, interior to the peripheral juncture; a first chamber ; a second chamber in fluid communication with the first chamber ; and a non-inflating region extending from the peripheral juncture to at least partially separate the first chamber from the second chamber , said non-inflating region comprising a generally vertical portion that extends upward from a bottom edge of the peripheral juncture between the first chamber and the second chamber ; wherein the non-inflating region has a width selected to permit in-plane bending of the inflatable curtain airbag in the deployed configuration, and wherein in the deployed configuration, the in-plane bending of the inflatable curtain airbag causes the second chamber to be angled downward relative to the first chamber , characterized in that the non-inflating region further comprises a generally horizontal portion that extends forward of the generally vertical portion to divide the second chamber into an upper segment and a lower segment , wherein, in the deployed configuration, the second chamber inflates inboard of a window; and the lower segment extends lower than a bottom of the window and lower than the first chamber . 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 an inboard fabric layer and an outboard fabric layer that are secured together at a peripheral juncture to define, interior to the peripheral juncture; a first chamber ; a second chamber in fluid communication with the first chamber ; and a non-inflating region extending from the peripheral juncture to at least partially separate the first chamber from the second chamber , said non-inflating region comprising a generally vertical portion that extends upward from a bottom edge of the peripheral juncture between the first chamber and the second chamber ; wherein the non-inflating region has a width selected to permit in-plane bending of the inflatable curtain airbag in the deployed configuration, and wherein in the deployed configuration, the in-plane bending of the inflatable curtain airbag causes the second chamber to be angled downward relative to the first chamber , characterized in that the non-inflating region further comprises a generally horizontal portion that extends forward of the generally vertical portion to divide the second chamber into an upper segment and a lower segment , wherein, in the deployed configuration, the second chamber inflates inboard of a window; and the lower segment extends lower than a bottom of the window and lower than the first chamber . <EOS>