I've never worn clogs. I have recurrent plantar fasciitis, sesamoiditis, and a weak ankle from torn ligaments on my left foot. I tried over the counter insoles, which worked a little. My doctor recommended orthotics at $400.  I decided to try clogs as the last stop before that.  Sizing was easy as I have worn european sized shoes before. The fit was different - loose in the back and all around, felt like walking in clown shoes at first!  I experienced some rubbing on the instep as well.  Noting other reviewers saying they need to break in, I wore them for 3 days dog walking.  It was an odd sensation as I kept thinking about my feet/shoes which I normally do not do when walking.  As my foot stretched the shoes and it molded to my foot, the clown shoe effect disappeared.  My foot stopped sliding and seemed to hold in place when I walked.  I stopped thinking about how to walk.  One major benefit for me was that my weak ankle ligaments/muscles felt sore for the first few days, meaning they were actually being strengthened!  Now they do not hurt but I can hold my ankle and arch up on my own.  This is a huge difference.  Additionally, I was having back pain and sciatic nerve pain and I am now walking much straighter and this has diminished substantially.  Previously, I could see one hip was lower than the other due to the super pronation on my week foot and now I am standing level and evenly.  I have not taken an Nsaid since I starting wearing these shoes!  I ordered another pair in a different color (the Juhl) and had the same results.  I am hoping that I will not have the wear issues I had with other shoes (wearing down one side due to pronating, which then caused more problems).  Hopefully my foot strike is more centered now.  Only time will tell on that, but for now, I feel great.  Highly recommend.  Sizing:  I am a 7-7/5 (8 with insoles) and took a 38.