COMFORT: Seatbelts do nothing to assist your sitting position in your car. Most of us start our car journey with good intentions... sitting upright with our spine pushed against the lumbar support... only to slip down into a slouched position after only a few miles. It's not your fault! It's gravity working along with the vibration of the car. However, soon you'll have a SHOFT fitted. This keeps you in that original healthy posture by keeping a tension across the lap.