In Australia they use the term "thongs" for "flip flops" and that is where this footwear comes from. They are a flip flip with a good amount of arch support built into them, so they are often used as an alternative to and as an adjunct to foot orthotic therapy.
A large number of podiatry clinics in Australia are selling them and many podiatrists are certainly using them for their own personal use.
The amount of support that they have built in is about the same as most of the over-the-counter foot orthotics that are often used, so there is no reason why they can not be used instead of foot orthotic or as a very useful adjunct to them when there are lifestyle issues about the footwear that can be used or preferred to be used. They can be purchased here.