Minimal midsole and thin five-toe KSO-style outsole. Ideal for barefoot workouts. It was hard to guess what shoe size is for USA. I have 10.5 for the drop down list. The label says US 10.5, UK10, EU 44.6. They are a bit big for my 11ft Nike height but I suspect the next size down will be a bit small. Summary I ordered a half US size and they are a bit big. I wear 44 in most Five Fingers. I hope this helps potential buyers.