4-3/4" width in back. Our "Power Belt" - Extra firm with reinforced neoprene (available in black only)-Patented downward angle fits the natural shape of your back-Patented hip and rib contour for extra comfort-Patented one-way Velcro® for an exact fit-Belts widen in front for extra abdominal support-Dual closure system with heavy duty stainless steel slide bar buckle