My daughter loves the look of "flats" with no straps, but she has so much trouble finding any that fit.  Either they squeeze her feet, or they fall off.  These are great because, first of all, they come in half sizes, and second, they have the unique strap that makes sure they will not fall off.  But, they still don't look like a "mary jane," which for some reason, my daughter doesn't like (I think she thinks they look "babyish.")