I previously bought the official track shoes in my size, but they were too tight, so I bought them two sizes up, so this time I bought them two sizes up from the start. I thought they might be a little big, but with one insole they fit just right. Compared to the official shoes, the instep is a little lower and the width is narrower, so if I had bought them in my size, I think they would have felt small. The size is just something to be careful about, but the quality is consistently the best (lol).