It is truly amazing; Suffering from plantar fasciitis with heel spurs I had no convincing results with traditional insoles made to measure. On a board "enlightened" I went on the brand Birkenstock starting with the mules. There miracle! once his foot in more pain! Could not tell you the relief and joy of normally sits on his feet. I continued in buying shoes created on the same model (elevated arch and heel stuck to the edges making less support center). Same result; I normally use and without apprehension. Also I transfer my sole in all my shoes with a maximum comfort. When you think about the price and the results obtained with a conventional insole! No hesitation to have. Quick tip, take exactly his size.