I love crocs and usually wear an 8 but the 8 is a little tight in these and the 9 is way too big.  I got the 8 hoping it would stretch but only wore them a couple times because they are so wobbly.  I hurt my ankle in them too because they are difficult to walk in.  (I have never had trouble with other shoes this height so I think it's the bottom of the shoe--it feels round instead of flat).  Go for a different style.