I am embarrassed to write a review.  I bought the size like other running shoes but GORun4 are very narrow on the front. If I bought a half size bigger I will see a hole in the shoes pretty soon. So, the size I choose correctly. However, they are very lightweight shoes, but I did not feel comfortable during my 10K and Halfmarathon runs,  beacuse of the narrow front of the shoes. May they are very good, but not for me. Fortunately, I managed to resell it.