These saved my vacation after the sole came off one of my original shoes before I even reached my DC hotel. I flip-flopped into the Comfort One Store in DuPont Circle and scooped these up within 25 minutes. The only downside was a fishing-line-like thread rubbing against my ankle, but I pulled on it and that took care of it; no more prickly place on the shoe. After that, I went four days straight in new shoes and they wore extremely well.
This is my second pair. I wore out the first pair walking the hilly, tiled streets of Portugal.