SmartWool uses their long-lasting blend of wool and nylon to make their Trekking Heavy Crew Sock as adventurous as you are. The sights and sounds of an exotic land should not be overshadowed by the smell of your socks. Arch support and padding aid in keeping foot muscles relaxed and protected during long trips. Wool has the ability to keep your feet warm and dry while the outside temperature goes from chilly to steamy. Foot funk and odors are naturally repelled for day after day on the trail. Wash these wooly socks in a stream and they'll be dry before you know it.