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SmartWool Women's PhD Outdoor Ultra Light Micro Socks

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When you've got miles to cover but want the minimum between your foot and boot, the SmartWool Women's PhD Outdoor Ultra Light Micro Socks are ready to go.

Whether it's a trail run at dawn or a hike in the heat of summer, the multi-sport Women's PhD Outdoor Ultra Light Micro features the power of Merino for maximum breathability, moisture management and temperature regulation.

Made with Indestructawool technology for ultimate durability and the 4 Degree elite fit system to keep the sock in place.


  • PhD: Built for Performance in the Highest Degree
  • Women's Specific Fit: Narrower profile provides perfect women's specific fit

  • 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

  • Ultra Light Cushion: Minimal cushioning for maximum performance in close-fitting shoes


  • Virtually Seamless toe

  • 1.5" overall height

  • Sock Height: Micro
  • Care: Machine Wash Warm Gentle Cycle. Do Not Bleach. Tumble Dry Low. Do Not Iron. Do Not Dry Clean
  • Made in USA of Imported Yarn: 50% Merino Wool, 49% Nylon, 1% Elastane

Women's Sizing: (Shoe Size Reference)

  • S: 4-6.5

  • M: 7-9.5

  • L: 10-12.5

  • XL: N/A

Smartwool Women's Socks Sizing

U.S. Women's Shoe Size4-6.57-9.510-12.5N/A
Euro Shoe Size34-3738-4142-4546-49
UK Shoe Size2-4.55-7.58-10.511-13.5
Calf Circumference (Largest part of the calf)11"-14.5" (18-26.5 cm)12.5"-16.5" (32-41 cm)14.5"-18" (37-45.5 cm)16"-23" (41-58 cm)

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