I bought US6.5 size,  the size chart on the item web tells that it equals europe40,  while in the inner side of the shoe, it writes that the US6.5 is europe39.5. So, the shoe is little small. However, I can get myself used to it. The sole is comfortable as the &#34;sensorflex&#34; technolgy. Moreover, what I have to say is that this shoe is thick because there is cotton inside, and it makes foot hot.