As to fit, I wear a ladies size 9 Narrow and the women's size 8 does just fine for me. I also have high arches and always have trouble finding good arch support, especially in a sandal. These OOFOS are wonderful for arch support. Since I take long walks on the beach, a comfortable shoe is very important. These are great! I also like that I can wade at the edge of the surf without damaging them. Maybe not the prettiest shoe in my closet, but who cares as long as they are comfortable and provide the arch support I so desperately need. I'm lucky to have found these sandals.