Very good and very thick wool sock. Not very fitted but nice and toasty. You might need to break out a bigger shoe for this one if you haven't already bought boots a little larger for winter. Good sock, don't know how long it will last but I'll find out by the end of winter. Don't know if it lives up to it's name but I really don't want to find out either. I would recommend as a knee/boot sock. Probably good for stationary activities like hunting(tree stand), sledding, maybe even skiing, etc.