Wonderful warm boots, Sorel really does it right.  Wore them out snowshoeing yesterday. Was  out for over 2 hours in 5 degree weather.  I was cold but my feet were TOASTY. Wore them to the Mall and my feet were HOT (definitely not Mall boots) I think they run true to size.  I take an 8 in all shoes, and the 8 fit me perfectly with room for extra socks if needed. They seem to be narrow in the ankle and hard to get on. the first time or two, But they get easier each time you put them on. I stuffed them with dishtowels overnight to stretch out the ankle a bit.  Would I buy these or any other Sorel boots again...ABSOLUTELY, you get what you pay for.