I'm a nurse and bought a pair of these about 10 years ago.
I tried to replace them a couple of years ago, ordered "Birki's" online, paid $90+. I received a pair that were huge compaired to what I had even though they were the same size. They were much wider and "flopped as I walked".  Even the Birkenstock customer rep. could explain why they weren't the same as my old ones.
When I saw the "Outdoor" Birki here, I realised that was what my old ones were.  They are narrower and better fitting.
Feels good to have proper fitting clogs again.