A safety restraint system for a vehicle seat having a seat back, a seat cushion and a frame includes an inflatable pelvis restraint device having a flexible member extending laterally across the seat cushion and having a first end and a second end. The flexible member includes at least a portion that is inflatable for increasing a height of the seat proximate a forward edge of the seat. In one embodiment, both the first and second ends are attached to the frame. In another embodiment, the safety restraint system includes a continuous webbing that defines a pelvis restraint portion, a lap belt portion and a shoulder belt portion. The lap belt portion, the shoulder belt portion, or both may be additionally inflatable.