I've never owned any Birkenstocks but I've fallen in love with these
https://www.thewhitecompany.com/uk/Birkenstock-Oiled-Leather-Boston-Mules/p/A09584?swatch=Beige
But £130!! Yikes! Not sure I can justify it. Fatface and Next have much cheaper versions, but would I regret that is the question 🤔