I been using these for a month and I am satisfied with them. I don't have back problems so I bought these just for the fitness perks. I have to say that I excercise more now that I have them because they are expensive. I put 4 stars because they are a very good product, quality, delivery and you can feel you are working more your muscles when you wear them. I did not put the 5 stars because I think they are expensive for what they are. I should have looked at Sketchers too before buying these.