Living in Hawaii, I wear sandals or flip flops most of the time.  Because of foot problems, I was buying/wearing expensive sandals but on a visit to my foot doctor, he told me to try Crocs --- he said they had been approved/recommended by the American Podiatry Association.  I never would have tried them on my own because they look kinda "funky" but I tried them on the doctor's recommendation and fell in love with them.  They are more comfortable than the expensive ones that I used in the past.  My only complaint is that the tread on the soles wears out much more quickly than the expensive ones (costing 5 times as much) --- after the tread wears down, I still wear around the house since they have many miles left in them but are apt to make you slip on wet pavement.