"Our 100% SmartWool guarantee applies to everything we make, " says Mark Satkiewicz, SmartWool's president.

WSJ: It Ain't Rocket Science, but Sock-Making Comes Close

Martin Criminale's merino wool socks made by SmartWool LLC, of Steamboat Springs, Colo.

WSJ: It Ain't Rocket Science, but Sock-Making Comes Close

SmartWool stands by its socks.

WSJ: It Ain't Rocket Science, but Sock-Making Comes Close