What's your favorite pair of flats?

My go-to flats for several years have been Frye Carson ballet flats--I have them in black and brown--but I'm literally wearing holes into them. Actually I already threw the black ones away, and I think today is the last day for the brown ones, there's a hole starting to wear through the sole...

Bonus if they're comfy! I walk about 3 miles per day/am in a city and don't drive...I'd get the Carson flats again, but I think I need more arch support now post-partum (the Carson flats have none, which didn't bother me at all before...) So extra bonus if they have a little arch support OH and I have super narrow heels...