They ARE true to size.  At first they feel very snug, but wearing them around the house a few times they settled in, the fur conformed to my foot, and the leather seemed to loosen up.  Even with a medium-heavy sock, they fit fine.  Of course they are not made for wear in rain or wet snow, but they are fine for very cold, even snowy days here in the city.  I'm also going to put waterproofing on them just in case I hit a puddle one of these days.