I own fitflop thongs (both style footbeds), regular clogs, shearling clogs, and hykas.  Of all of these Fitflops, I've never had anything run huge. These do.  I actually double-checked the receipt to confirm that these weren't men's shoes.  There is no lining inside, so we're talking about a single layer of suede between you and the elements...so I guess room for huge bulky wool socks is a good thing.  Once it gets cold enough to drag out my thick wool socks I'll update this post.  Glad I got a good deal...otherwise they'd be going back.