I read the reviews before I purchased, and ordered down a size because most people were saying they run big. I wear an 8.5 / 9, so I ordered a size 39. They were very tight on my feet, especially the instep pushing on the top of my foot. I loved the style so much, I returned and ordered a size up, my usual size in clogs, a 40. The new ones fit PERFECT!!! There’s some wiggle room in my heal (as you can see in the photo), but that’s the way this style clog is suppose to fit. I love them!!! Super cute and amazing comfort.:) And excellent quality for the price.