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x Backcountry PhD Superior Sock

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Why We Built The PhD Superior Sock with Smartwool

We teamed up with Smartwool to create the PhD Superior Sock, featuring their trusted Indestructawool technology for the durability we need during our busy ski season. The seamless, cushion-free design delivers a responsive performance fit in our boot, while breathable and temperature-regulating merino wool keeps our feet comfortable during full days on the mountain.


  • Lightweight, cushion-free ski sock for advanced riding
  • Merino wool blend is insulating and moisture-wicking
  • Body-mapped mesh zones for added airflow in keys areas
  • Virtually Seamless toe for a rub-free fit inside boot
  • 4 Degree elite fit system prevents slipping or bunching
  • Naturally antimicrobial merino wool helps control odor
  • Item #SWLZ910
55% merino wool, 41% nylon, 4% elastane
over-the-calf (14in)
skiing, snowboarding
Manufacturer Warranty
limited 2 year