The Houdini 28 harness can also be used to offer postural support and assist in seating the occupant in an upright position for persons with physical disabilities. The harness attaches vertically around the vehicle seat and access is required between the seat back and cushion. The vehicle safety belt must always be worn over the top of the harness for safety. A safety webbing slicer is included with every harness and should be kept in the vehicle as a precaution. It is recommended to carry out a safety and risk assessment before using the harness.