If you're thinking about ordering these, or just about any other Keen shoe/sandal.  The sizes tend to run small.  I read this in another review prior to ordering so I ordered these boots in a size 11 when I typically wear 10-10.5.  The fit and feel great, they were slightly snug when I first put them on (which any shoe should be when initially wearing)...they keep my feet warm and toasty and have good traction.
***UPDATE***  As of 2/1/13, these boots are great.  Sizing definitely runs small, so get, at least, 1/2 size larger than you normally would.  I wear them to work and use them on the weekends and I've had NO issues.