These are similar to our regular -40 Below Artic Trail socks but with a unique snowflake design on the leg. If you are looking for one of the warmest socks available look no further these contain an astonishing 85% wool! It was designed for people who require a sock that can keep their feet dry and warm in the most extreme conditions. We recommend wearing a liner sock to help wick away moisture because it will keep your feet smelling fresher, warmer and blister free!