I almost returned these for the reason that others have criticized: the tightness of the heel and rubbing it causes. However, it broke in a bit after wearing it a couple times and now is ok. Note, however, I use it just at the gym... I would not use this to run it because the rubbing would make it prohibitive.They fit perfectly, I ordered a half size bigger. There was a problem with the inner stitching though (left shoe). I wore them to work the first day--office job, nothing athletic--and left with a bloody sock and bandaid on my left Achilles. I was eager to see how they felt at the gym and my adrenaline helped for my warm up, but once I got off the treadmill and started walking around the pain intensified. What's up NIKE? My right foot isn't any greater or less than my left.I was told by other to order a half size up, which would be a 12.5 for me. They didn't have it so I took a chance and went for 13 and couldn't be happier. I haven't took them to my gym yet but I don't want to take them off in my house. Anyways main point: order full size from other Nike for optimal fit.I had to return this item because out of all of the NIKEs I've purchased, this was the only one that was poorly sized. Also, the photo displays more of a red shoe but in person the front part looks more orange.They are 1/2 a size too small and the back of the shoe hurts the ankle if you wear short sock.Great Product. A- because of the sizeOutstanding product. I'd buy it againWe LOVE these sneakers- can't imagine wearing anything else now. They do run a size too small, though, but we knew this from research, so we ordered a size 11, even though my son wears a 10- they fit perfectly.