These are the shoes that are supposed to give you a workout while you wear them. Masai Barefoot Technology or MBT shoes are shoes inspired in design by the non-shoe wearing Masai tribe of people from Africa. The shoes have a rocker bottom that is supposed to simulate the natural gait of walking barefoot exhibited by these people and as these people have no back problems, this has to be a good thing. There does seem to be some sort of flaw in that logic. The company do make many claims for the benefits and clinical efficacy of these shoes and their effects on posture and postural problems. There is not much evidence to support the claims made. So, do MBT shoes work? There is probably enough research that can be combined with some theory that makes sense and with anecdotes to suggest that they will probably do work in some sub-groups of people and not in other groups. What is now needed is some more research to help guide which groups and who will benefit the most. The shoes are not cheap and can be a costly mistake.