This is the first FitFlop clog I have tried.  I looked at the measurements and it was close in heel height to the Mukluk and that seems to be my magic formula.  They are great for my wide forefoot.  I have discovered that although I am an 8 and 1/2 I need to get a 9 in the boots and 8 for sandals so I went with an 8 for these. They are just a teensy bit big so 9 would not have worked. If you are an 8 you might even consider a 7. The extra room does not let me pronate though because the instep hugs my arch w much like their sling sandal I purchased here last month.  My only concern in wearing them outside is that I might fast walk out of them with the dogs. So I am considering the professional version with a strap on the back.  Then it is just a question of whether to keep both or give this one up. (sniff) Have to look at the bank account. Especially if the VIA BARR arrives at Amazon in black. But the difference in the pain factor is just amazing with this brand.