Vehicle including a system for preventing injury to an occupant's head and neck during a rear impact includes a support structure for supporting the occupant including an upper body support portion for supporting the occupant's head and neck. The support structure has a deformable upper body support portion which may be filled with a fluid such as air, liquid or a gel and deforms during a rear impact to support the entire back, neck and/or head of the occupant. The upper body support portion may be moved to a support location, regardless of the detection of a crash (a passive mode), or moved only prior to an anticipated impact as determined by a crash sensor (an active mode).