They were slightly big but once I tightened the cords they fit just fine.
Besides the slightly larger size and the issue with the material around the ankles ("bites" into my skin) I don't think I'll be returning them. If I go by past experience I'm almost certain they'll be a dream as long as I'm wearing socks with them. I may not wear them for my upcoming vacation as I'd hoped but I'll definitely try them when I go camping and hiking. With socks of course.
P.S. They're super lightweight which is awesome!