Smartwool PhD Outdoor Mountaineer OTC Socks

Size Chart
Bright Orange

Smartwool's SW015046 PhD Outdoor Mountaineering Over the Calf sock is designed to be appropriate for the most serious climb, but we like the look and feel so much we see no harm in wearing on a range of not-so-athletic endeavors.

Designed in partnership with famed climber, Conrad Anker, the SW015046 is the most technical mountaineering sock Smartwool has ever made.

Smartwool's revolutionary Indestructawool technology means these socks will last and last. 4 Degree Elite Fit System fine-tunes the fit of these socks--they will not scrunch or sag, no matter how long your day goes.

High-density cushioning is present only where you need it: the heel and toe, to protect against injury while leaving the rest of the sock comfortably thin and bulk-free.

Smartwool's premium Merino Wool encourages good odor and moisture management. Like all Smartwool socks, the Outdoor Mountaineering sock is washer and dryer safe.


  • Over-the-Calf Height (14" overall height)
  • Light Elite Cushion: High-Density Cushion in Heel and Toe provides protection and comfort in high-impact areas, while flat knit leg accommodates fit of low-volume mountaineering boots
  • Indestructawool technology features a wool-based, patent-pending yarn and construction method for exceptional durability and comfort
  • 4 Degree Elite Fit System for all day performance fit
  • Smartwool inside for moisture, temperature and odor control
  • Strategic Mesh Zones for maximum ventilation
  • Washer and Dryer friendly
  • Made in the USA


50% Merino Wool, 49% Nylon, 1% Elastane

Sock Height

Knee-High Height Sock

Sock Cushion

Medium Cushion Sock

Customer Reviews

Based on 1 review
Smartwool socks really are the best.