Buy one size larger
I am a huge fan of Crocs shoes. I have wide feet, so it is usually difficult to find shoes that fit. I ordered a size 8 (women's) in these shoes (my normal size in Crocs and other brand shoes) and they were too small. I returned them and got a size 9 which fit perfectly. So, yes, they do run small. Other than that, no problems with the shoes. They are lightweight and comfortable.