Was concerned about sizing since I don't get to try them on.  Read other reviews and this is my opinion.  I think these run very true to size.  I bought my regular size (8.5) and they fit as they should.  I did not account for the thick wool socks I will want to wear with these come winter. (even though other posters mentioned this!) I walked around in my house with the thick socks on and decided to go a 1/2 size up.  The boots were fine in length with the socks but a little tight around the ball of my foot up on the top of my foot.  I plan on using these for long hikes and snowshoeing so I figured they would be uncomfortable after an hour.  I exchanged them and had to pay return shipping (which was very reasonable at $4.98).  The size 9 shoes are a tiny bit big with the thick socks but I think they will be better in the long run.  Can't comment on how warm these are as it is June, but other posters have positive opinions on this.  Bought them now because they were such a good price and hard to find in the winter.