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PhD® Mountaineering Socks
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PhD® Mountaineering Socks



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Familiar with the classic SmartWool® Mountaineering sock? Say hello to the stronger, more durable, more comfortable PhD® Mountaineer. ReliaWool™ technology for improved durability in the high wear areas and the 4 Degree™ elite fit system, to keep the sock in place and give you all-sport versatility.



Built for Performance in the Highest Degree

4 Degree™ Elite Fit System
4 Degree™ Elite Fit System

Uses two elastics for greater stretch and recovery to keep the sock in place


Patented ReliaWool™™ technology in high impact areas provides superior durability

Ultra Light and Heavy Cushion
Ultra Light and Heavy Cushion

Minimal cushioning in the leg and foot for maximum performance in mountaineering boots combined with Heavy Cushioning in the toe and heel for protection and comfort.


  • Strategically placed mesh ventilation zones provide ventilation for temperature and moisture management
  • Flat knit durable toe seam
  • Heavy cushion heel and toe for maximum comfort and protection in the highest impact areas of the sock
  • Flat knit foot and leg with heavy duty yarns for maximum comfort and protection in low volume mountaineering boots
  • 14" overall height
  • Sock Height: Over the Calf
  • Knit in USA of Imported Yarn: 70% Merino Wool, 28% Nylon, 2% Elastane
  • Style: SW0SW048


  • Machine Wash Warm Gentle Cycle.
  • Do Not Bleach.
  • Tumble Dry Low.
  • Do Not Iron.
  • Do Not Dry Clean.