PhD: Built for Performance in the Highest Degree

4 Degree Elite Fit System: Uses two elastics for greater stretch and recovery to keep the sock in place

Indestructawool: Indestructawool tec...

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PhD: Built for Performance in the Highest Degree

4 Degree Elite Fit System: Uses two elastics for greater stretch and recovery to keep the sock in place

Indestructawool: Indestructawool technology features a patent-pending construction method for exceptional durability and comfort

Mesh Venting: Mesh ventilation zones provide optimum moisture management and maximum breathability

Heavy Cushion: Heavy cushioning offering significant impact absorption for extended backcountry excursions

When ultimate warmth and comfort are what you need, pull on the PhD Heavy OTC. We've updated this classic style with Indestructawool technology for ultimate durability and the 4 Degree elite fit system to keep the sock in place. Heavy cushioning provides warmth for even the coldest days.

Care Instructions: Machine Wash Warm Gentle Cycle. Do Not Bleach. Tumble Dry Low. Do Not Iron. Do Not Dry Clean.

  • Indestructawool technology features a wool-based, patent-pending yarn and construction method for exceptional durability and comfort.
  • 4 Degree elite fit system uses two elastics for greater stretch and recovery to keep the sock in place
  • Strategic mesh zones balance warmth with breathability, thermoregulation, and moisture management
  • Virtually Seamless toe
  • 14" overall height
  • Indestructawool technology features a wool-based, patent-pending yarn and construction method for exceptional durability and comfort.
  • 4 Degree elite fit system uses two elastics for greater stretch and recovery to keep the sock in place
  • Strategic mesh zones balance warmth with breathability, thermoregulation, and moisture management
  • Virtually Seamless toe
  • 14" overall height

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