Familiar with the Mountaineering sock, one of our classics? Say hello to its technologically advanced cousin, the PhD Outdoor Heavy Crew. The 4-Degree Fit System keeps this heavy full-cushioned sock in place.
Knit in USA of 86% Merino Wool, 12% Nylon, 2% Elastane
- 4-Degree Fit System For All Day Performance Fit
- Wow Technology In High Density Impact Zones To Reduce Shock & Abrasion
- Smartwool Inside For Moisture
- Temperature And Odor Control Strategic Mesh Zoness For Maximum Ventilation
- Additional Information