I spent this past weekend wearing these boots while camping. It got to be 40 degrees Farenheit and I was not only warm in these boots, but comfortable. I wore thick socks and didn't have any issues with breaking them in. The fur on the inside is soft and I didn't have any callouses, even after hiking around for several hours. The half a size up was a good move to make. I have really skinny calves, so the only tiny issue I had was that they're a little roomy around my leg, but I can tuck pants in the boots and it wasn't an issue.