Hello Jürgen! As promised, tomorrow I will reluctantly send the test shoes back to you. Although I am still not an active walker, even on my short walks I noticed a huge difference between my shoes and the kybun shoes. The way I stand is very different and the shoes even make it easier to stand up. I’m impressed! Honestly, I swear on kybun shoe. I would never have believed the shoes could make walking feel so secure and comfortable. Recently, my kybun shoes got wet and I had to switch to normal shoes. Nothing seemed to work anymore and I was walking like a stiff puppet. I never want that to happen again!