Very comfortable. The laces let you make them tight or loose so you can wear them over different types of pants. I wore them out today in 12 degree weather and my feet were warm and very comfortable! They feel very solid but light and easy to walk in. Better than I was expecting :)

***Update: These boots are amazing. I live in Greater Boston and we were just plummeted by a blizzard. I actually went out in the height of the blizzard with some friends. My feet were just about the only part of my body that was warm! These boots trekked through 3 feet of snow, hurricane force winds and never felt a single chill! The roads were also very icy and all my friends kept falling. I never fell once and I think it was because of the boots. Great grip on ice. Now, a few days after the storm, the boots are still great in the watery slush. Completely water proof and cold proof! Favorite winter boots I have ever owned. So glad I bought these before this blizzard!!