II tried these because the usual unshaped sheepskin slipppers are not enough padding for my feet. If I could have found a size to fit I would have been extremely happy. I tried two sizes and neither fit just right. Also, surprisingly, the Fit Flop brand which works so well for many people with foot issues had no arch support and thus the wobbleboard base set my plantar fascitis  on fire. The 8 was not big enough for an insole so they went back.
Dec. 9th update:  The first Fit Flop I tried was the Ultra Lounger. I went up to the next size as Fit Flop recommended. I believe they were what caused my plantar fascitis to flare as they were too big and they have a higher slope. Following that I tried these and maybe half the ankle boots on Amazon as well as numerous insoles and arch supports. Well, I got a pair of the Sole Angel Struts, gave away the clog style slippers and let my feet calm down. Then I decided to try this boot again, but going DOWN a size so my foot would not slide around. I wore them with the stap-on arch supports on a stone floor yesterday and it is one big thumbs up. No sliding forward on my forefoot so no pain and the arch support stopped the heel pain. Now getting the benefits of that great padded barrier between the concrete and me. I am also finding  that they do help with knee pain. They are keepers. Now that I know to stick with with the flatter bottom, size down and wear arch supports I will probably end up with more Fit Flops.