I had actually bought some Nikes at our local Nike outlet.  I liked what I had bought but had recently set up an Amazon account so I thought I would check out what Amazon had to offer. I was a bit skeptical because I had never bought shoes online before and know sizes can vary between brands.  I typically wear an 8.5 so I went ahead and ordered that size. As soon as I tried them on, I knew I was going to return the Nikes. These are great!  I wear them for going to the gym and walking the neighborhood. I do mostly cardio exercises in these shoes.  They fit me like a glove. I would highly recommend them. I have severe ankle issues so I am always very careful about finding shoes that help me prevent further sprains. While these do not specifically do anything to prevent me from spraining my ankle, they do not cause any problems that would make it more likely for me to have issues. The Nikes I had bought, seemed to angle in toward the other foot. The bottoms of these shoes are very flat. The inside has an arch that supports my foot really well. I do not consider myself a person that has a flat foot nor do I have a large arch. I love these shoes and highly recommend them. Have I mentioned that yet? :-)