The shoe is initially stiff and has to be worn, also the placement of the zoom module is not very well thought out. There is nothing on it to prevent it from crashing into the center bottom of the forefoot. It's so small and sharp because its triangular shape also concentrates all of the pressure it generates underfoot into an equally small area. So, after wearing it for a while, it starts to get uncomfortable, e.g. B. if loose fluff from your sock collects in the area or dirt gets into your shoes. Therefore, if you have orthopedic problems with your feet, I do not recommend you to buy these shoes. Other than that, it's a pretty decent shoe, but I think they could improve on the design and placement of the zoom module.