My Croc Bistros were about 1-size too-small--snug but tolerable. Only after a few weeks did I develop toe
numbness and pain from wearing my Crocs. I tried on the same shoes in a local shoe store and my feet were
swimming in the Crocs (roomy). The only difference I noticed between the local shoes and the Amazon shoes
was the country of origin. The online shoes were from China whereas the local pair was made in Mexico.

I suggest that you try a pair on at a local retailer (the price will likely be higher)  then compare with your
online purchase upon receipt. It's possible that my Crocs from this site were exposed to heat at some point before
I received them, or maybe there is a difference with the Chinese version.

Amazon customer service was very helpful with my issue.
I give the Amazon rep 5-stars.