Introducing the

              of PhD® Socks

Meet the new PhD® Outdoor socks, featuring patent-pending Indestructawool™ technology.


Exceptional durability. Extraordinary comfort.


Introducing the new PhD® Outdoor socks with Indestructawool™ technology, a patent-pending, merino wool-based durability construction made to outlast your greatest adventures.

PhD® Socks represent the highest degree of performance. We pack these wool socks chock full of smart features, advanced technologies and dialed fit systems. They’re hiking socks that help you forget about what you’re wearing and focus on the trail ahead. Because you’ve got miles to go, and you couldn’t be happier.

Features of PhD outdoor socks with indestructawool technology

Climbing the most technically challenging terrain in the world is just another day at the office for Conrad and having the best cold weather gear is critical to his success.

In searching for the best cold weather socks for climbing, Conrad found a perfect partner in our master sock developers. His attention to detail, years of experience and on-mountain field-testing helped us create our most technical mountaineering socks ever.

Part of the all-new PhD® Outdoor Sock collection, the PhD® Outdoor Mountaineer offers a perfect balance of comfort and durability.

Meet the new
      PHD® SOCKS

So what makes our new hiking socks so unique? Take a sneak peek at the inspiration, development and testing of the new PhD® Outdoor Socks.

PhD® Outdoor Socks

Smartwool's PhD® Outdoor Socks V3 with Indestructawool Technology