I ordered this pair of Crocs in the hope that they would fit better than the pair of 9M that I had purchased elsewhere that seemed to be to roomy. Unfortunately the 8M was not roomy enough and rubbed on my right little toe causing discomfort. This is my first purchases of Crocs and I did not know what to expect. I guess that I still don't since one size smaller was very much smaller than the previous pair. If you are new to the product, as I am, I would suggest a trip to a Crocs store to get a better idea of your size. Apparently, it depends on your needs as to how the Crocs are sized. Diabetic requires a different style than Plantar Fasciitis etc. Once you chose your style, you can likely purchase online based on the style number and hopefully it will fit correctly, although some reviewers have mentioned that even within the style it can depend on where it was manufactured. China fits differently than Mexico. Good Luck.