I have super wide feet & wear a 8.5 WW shoe sometimes. I ordered both the 8.5 M & 9 M. The 8.5 was too tight (but would probably fit a W foot). The 9 was just a tiny smidge tight on me, but considering that I can't usually even get a regular width shoe on my foot, I'd say these are pretty wide! Also the fact that they lace all the way up & have a very large piece of material behind the laces means that they are easy to adjust to fit a larger calf. There is extra length on the upper straps so you can add a hole to them if you need to make them longer. Bought these for a cosplay, so I can't attest to their durability long-term. But I'm so happy that they fit very comfortably & look fantastic!