Since I had already bought this brand for my daughters, I make the same purchase for my son. He even chose the color and it is perfect. Believing that it was cutting big as the other, I had taken two sizes below and it was not good. So I'm doing another command instead of 37 and returned the other. Right now, it suits him very well and I did well to take the 38. Anyway, none of my children has a fair size. It's quite difficult to choose the right size without error.