I was looking for some new running shoes so I went to a shoe store and tried these on (I got the black/gray ones).  I'm usually a size 6 in most shoes and when I tried the 6's on, they felt a bit too tight even without socks on. I tried on the 6.5's and also the same thing. The 7's though fit perfectly. I know everyone may not have the same experience as me, but it may be wise if you're buying these to go a size up if you're unsure. Other than that, I really like these.