These sneakers are very comfortable and true to size, although the tag on the inside of the tongue only shows the EU size. I wear a US men's size 8 and the tag says 41. In any case they fit well, look good and are comfortable to wear. The mesh on the outside allows for good breathability, but you can also see through your socks - FYI. If you don't mind too much that the brand name isn't Nike, Reebok, Adidas etc. then I definitely recommend getting this shoe for running or working out in the gym.