The fit issue that some people speak of was not present for me. I wear between a 5/6 US and ordered the smallest size. They fit great and were very easy to adjust.
***Edit: So I was training for a backpacking trip today and used these on the treadmill. My regular strap adjustment (slightly loose) allowed for pull when using them on the treadmill so I adjusted them to be tighter. I adjusted the front and back straps to be much tighter. This is when I realized that it pulled my heel to the side like shown in other reviews. I loosened the back strap a bit to allow for heel movement but kept the front straps tightened down and it fixed the issue. I’m not sure if this is the issue for others, but I’d def play around with strap adjustments.. it takes a bit of time to find the right “setting”, but well worth it if you like minimalist shoes. These may not work for some with wide feet; I have fairly normal width feet and have about half a cm of footbed showing along the outer edges.
**also, I do not work for this company, I’m not an ambassador, nor did I received these for free or at a discounted rate. I’m just a person that suffers from blisters while hiking and have been on the hunt for the most effective and efficient foot ware.