When I first got these, upon trying them they felt a little tight. I wear size 11.5 in men’s. I bought size 12. I had to put them back to back with my adidas Ozweego’s size 11.5 to see if they were smaller. As you can see in picture, they are bigger than my Ozweego, so sizing is accurate. But the cushion inside is thick, as these are performance shoes. They’re meant for high impact activities. I’m not a basketball player but I run so I took them on a 3 mile run. They now fit much better. So I would recommend buying a size up, and doing rigorous activity with them a few times. They can take the beating and NEED to be broken in.