Keens have pretty high arches. My feet have very high arches too, and I find the Keens feel divine and supportive. Been wearing several Keens for over a year now- I LOVE their high arches. For me it feels like having a great ergonomic office chair that gives you good lower lumbar back support.
I know other people with more flattish feet that have had arch pain when they try to wear Keens.