I wear an 8.5 shoe, ordered this one in 8.5, and my foot was swimming in it. I'd say if I'd ordered a half size smaller than what I needed it still would've been ample in sizing. These weren't quite as cute out of the box as they are in the pictures. Also, the arch support is soft and only moderate, which isn't what my painful,
fallen arches need. In the same order I also ordered a pair of Orthaheel athletic
shoes, as well Orthaheel flip flop type sandals and both of those
shoes have firm (
almost hard) foot bed and arch support. These mary janes do not have the same kind of support found in these other two Orthaheel products.