Hi Debra,
About plantar fasciitis, I can't say. Both arches on both of my feet are flat and I have bunions ( more than anyone wanted to know, I am sure), and I have a dreadful time finding comfortable shoes. The foot is not entirely flat in the shoe, the heel is elevated about 1 1/2 inches.
You could contact the
company , or perhaps your doc to see if they had any experience.