Toning shoes are shoes that you need for an extra tone up when you are exercising or going for a walk. They are unstable and are supposed to make the muscle work harder to give the tone up. There is some debate if that actually happens or not, but those that use them swear by them.
There are plenty of websites that discuss these shoes in details and what they do and do not do. There is also plenty of discussion available on some of the legal problems that the manufacturers of these shoes are having due to the extraordinary claims that they made for the toning shoes. Despite these issues many people do feel that the shoes are helpful for some of the foot and postural problems that they have. Some people do not like them, but others do.