I was a little worried when buying this because I was worried the boot would be too small. (I'm a size 12) However, they fit as expected and are really comfortable. They didn't even need to be broken in! I live in southern Florida, there really isn't much hiking to do around here as almost all of Florida is pretty flat and it's always warm or hot, I bought these for everyday wear, style, and so that my feet would stop getting soaked during Florida's bipolar weather, so far they have not failed me. They are warm, but not uncomfortable, but they are not that breathable. I wore my Asics running shoes and these boots during a full work day and didn't feel much difference.