The Outlast Weather Warrior Crew Sock combines temperature regulation of Outlast fibers and softness of Merino wool. Put it all together and you have comfortable feet that are warm in cold weather and cool in hot weather. The all-around perfect boot sock for hitting the trail. The fortified shin and foot make it extra tough in those extra rugged terrains. Explore the great outdoors with all the comfort and protection of home, in the Outlast Weather Warrior Crew Sock.