Consider that this is a German company - I can't speak to each and every inch of the place, but I used to live there and travelled around some while there, and have yet to come across a rock too hot for the tootsies... The place just ain't known for neither its heat waves nor its burning sun.
This is also the country where it is possible to get those wooden beaded mats for your car seat for its massage effect. I used to have one and liked it. Perhaps there is some of that effect in this footwear going on.
I have funky taste, and would have zero problem wearing these, fashion-wise. I actually think they are cool. No plastic/rubber recycling problems with these shoes like Vibrams (or my beloved Keene's) either. Interesting!
I have a mantra that I have spouted for years... "If I eat right, I feel right. If I feel right, I exercise right. If I exercise right, I think right. If I think right, I eat right..." Phil-SC