This worked great in my 3 inch wedges.  Not so effective in my 4 inch boots though- not sure if its the height limitation or just the lousy steepness of my boots. I love that its hard plastic and actually supports the arch. It comes with velcro sticky dots, but completely unnecessary as it stays in place once your feet is on top of it. Its easily transferable to other shoes, unlike those sticky gel pads. Way better then Dr. Scholl's arch support gel pads for heels- sorry I wasted my money on that stuff.