It is really strange -- these sneakers match up to my other pair of Nike running sneakers, both on the outside when I align the heels and toes, and also the insole inserts match perfectly. They are really just too tight on the toes. I also have quite a narrow heel and they were slipping. An odd fit, to say the least. I love the pink color and really wanted to love them. I am a size 8 in heels and normal shoes (e.g. sandals, heels) but usually wear an 8.5 in running sneakers. I ordered an 8.5. I think 9 wouldn't be much better with the heel slippage, though.