I just double checked the link, and they also just emailed me back, so It Does Work, If you have trouble, try typing the link into your browser, and then see if it works,.
The idea is an covered gathered elastic that is either plain colored, or fancy with decorations....The idea is like a figure "8" and one of the loops of the figure "8" goes around the shoe (under the sole) and the other figure"8" goes around your ankle. they are going to send me a sample, so I will let my wife see them and see how they work....She has an inbetween size of foot, Wider foot, narrower heel, and some shoes slip...
Try the main site, and then click through the choices...
http://www.mymuletto.com/