Based on another review that claimed these boots ran small, I ordered them in a half-size larger.  I normally wear an 8 or 8.5 ladies shoe, and ordered a size 9.  The reviewer was mistaken; they don't run small at all and the 9 is, in fact, too large on me.  I'll probably try wearing several layers of socks rather than return them, but an 8 would have fit me fine.

They are very warm, very substantial boots, and I love the arch support.  Very comfortable--had I ordered the correct size.