I have owned the anasazi mocasym, anasazi velcro, and the anasazi lace. The mocasym will stretch one half size but it has a leather upper. With the velcro and lace you would be fortunate to experience a quarter size of stretch. I would size the velcro one half size smaller than the lace. These are not comfortable shoes but they do perform well. As per comparing them to sportiva miura's and mythos....5.10's performance shoes have a completely different fit. They pull all of your toes towards the inside edge, "asym toe design". For me I sized down 2.5 for velcro and 2 for lace.