Packed from top to toe with elite performance technology, Smartwool® PhD® Light Crew Socks are the tested and true favorites of mountaineers, high-mileage hikers and anyone who puts their feet through their paces. You’ll know why on the very first day you try them, thanks to an exclusive 4-degree™ Elite Fit System that hugs the foot and moves along with you – no bunching, chafing or slumping. Better yet, the Virtually Seamless™ toe won’t create painful pressure points within your shoes or boots. And you’ll never experience a hot spot or blisters thanks to the temperature management of premium merino wool.