ATC = Appalachian Trail Conservancy. Every sale of this sock sends 5% to the ATC, which provides outdoor education programs and maintenance of America's first national scenic trail. And, you know, it's a great sock.

Backed by Darn Tough's lifetime warranty. On socks. It's true.

Features

• Performance Fit: No slipping, no bunching, and no blisters.
• Fine Gauge Knitting: Unprecedented durability and our unique “put it on, forget it’s on” feel.
• Fast Action Wicking: Pulls moisture away from skin. Fast drying.
• All Weather Performance: Cool in the summer, warm in the winter.
• Naturally Antimicrobial: Repels bacteria and odor.
• Merino Wool: The ultimate fiber for breathability and comfort in all conditions.
• True Seamless^™: Undetectable seam fusion for an ultra smooth, invisible feel.

Made of...

• 61% merino wool
• 36% nylon
• 3% lycra spandex
  
• The blood and sweat, er, hard work, of people in Vermont, USA