I bought the leather Birki's wt. cork insert,only lasted 6 months before leather split at seam.Got the plastic(polyurethane) & inserted the cork fr. my wasted leathers.These have lasted 2 yrs. & are the most comfortable for long standing.I agree they are not that great for alot of walking.They are super easy to clean,I can see how they have become so popular.
One thing about clogs you have to be super careful emptying H2O fr. steam kettle or handling oil etc.Not much protection wt. clogs.