A restraint system includes a seatback frame, a webbing guide attached to the seatback frame, webbing extending from below the seatback frame through the webbing guide, and a tether attached to the webbing and retractable to the seatback frame above the webbing guide. The restraint system may include a roller coupled to the seatback frame above the webbing guide, and the tether is at least partially wound around the roller.

A vehicle seating system includes a vehicle floor, a seat supported by the vehicle floor, a retractor mounted to the vehicle floor beneath the seat, a webbing guide supported by the seat, and a webbing extending from the retractor through the webbing guide.

A vehicle seat to be mounted on a vehicle includes a seat cushion and a seat surface lowering mechanism. The seat cushion includes a seat surface on which a waist of an occupant of the vehicle is to be placed. The seat surface lowering mechanism is configured to lower the seat surface in response to either one of an occurrence of a rear-end collision of the vehicle or a sign of the occurrence of the rear-end collision.