The sole is extremely comfortable as hoped for. They are a bit narrower than I would have liked. I have an average width foot, and my big toe hangs off the side slightly. I was hoping they would be the width of Yellow Box flip flops but they are not. Only complaint.

About the thong portion on this style: I ordered two pair of this style and one pair of another Sanuk yoga flip flop. This pair had the tightest thong, which I find important because I don't have to work as hard to keep it on my foot (important since I have arthritic feet). The other two pairs I returned because the thong was quite loose.