If you wear a size 38.5, get the size 38 because their sizing is big. The insoles are like little cushions. Personally, they didn't work for me at all because as soon as I wore them, the feeling was so low that I felt like I was walking barefoot...
When you see them in the photo, it seems like the back part is slightly raised, but unfortunately it is so minimal, as if there is no difference at all! In my opinion, they are not suitable for those who have waist problems...
Such a shame....and I was really looking forward to them....