We bought these boots for my 10 year old daughter. She has been wearing them to school in temperatures of about 20 to 25 degrees Fahrenheit and her feet have never felt cold in them. "Really cozy" is how she puts it. She likes that the fur inside the boots starts at the very top. Also, she likes being able to open the side zip on the rare occasions when indoors and her feet get too warm. We are also impressed by the detachable (and replaceable) heel.

Highly recommended.