This hat (in natural) is definitely NOT the "warmest". Honestly, it's not warm at all even when it's 25 degrees F outside, and it's a friggin' waste of time when it's sub-zero. It's not long enough to cover my ears, and if there's any kind of breeze, my head is freezing. The pom-pom on top of the hat is too big so as you walk, it moves and pulls the hat at awkward angles (and off my ears). I really want to pull my hood up over this hat to add more warmth, but the pom-pom is too big to fit under hoods that are not helmet compatible.