I didn't want to get these but my podiatrist recommended this brand... 60 dollar flip flops are nuts to me but I will give it a go.
Only been a couple days and my feet hurt bad because these are definately made for arch support. I have extremely flat and rather wide feet. I always order my running shoes in wide and typically wear a 9.5. I also usually just wear crocs flip flops that are flat and light weight.
Again, the arch on these vionic sandals are killer if you're not used to it. My foot feels bruised where the arch hits, should adjust over time but something to be aware of if you've got real flat feet.  I think these run slightly large and wide since my feet fit in these in just a regular size 9.
They soles are thick and heavy and quite substantial for a flip flop - kind of feels like I'm stomping around in them. I am hopeful these will help the constant foot pain i've had.