The bottom of this was somewhat more padded than the biker boot. If I could find this in an 8 and a half I would get it. Sadly, they were just a bit too big.
12-19-12 UPDATE:  I have a size 8 I am trying now. It is just a bit too snug in the instep and forefoot. I went through both the men and women's measuring guide on the Flip flop site, then called and asked if the men's US 7 was built on a wider base. Answer: YES
I have done this with men's sneakers before when there are no half sizes or just one width. I suspect that if I hunt down a men's 7 I will be just right with a small arch support. And yes, I added my voice to the reviewers here who have requested half sizes and width choices. They are working on some half size styles now. YIPPEE!