What features on the Hill-Rom® Procedural Stretcher allow for easy raising and lowering of head section?

What features on the Hill-Rom® Procedural Stretcher allow for easy raising and lowering of head section?
 

With BackSaver Fowler® feature, let the patient's own weight help raise and lower the head, taking the load off your back. The Auto Contour mechanism also includes the BackSaver Fowler feature to help take the burden off your back.