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SmartWool Women's PhD Run Ultra Light Micro Socks

Style: SW188
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SmartWool put their all into the new and improved SmartWool Women's PhD Run Ultra Light Micro Socks that feature the 4 Degree Elite fit system, ReliaWool technology for superior durability and a virtually seamless toe. Women's-specific mesh ventilation zones provide ultimate temperature and moisture regulation where female runners need it most.


  • 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

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

  • Mesh Venting: Women'’s-specific mesh ventilation zones provide additional breathability and moisture management

  • Ultra Light Cushion: Minimal cushioning for maximum next-to-foot performance without added bulk


  • Narrower profile provides perfect women's-specific run fit
  • Virtually seamless toe

  • Achilles tab

  • 200 needle construction provides highest knit density while maintaining ultra light weight

  • 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: 48% Merino Wool, 48% Nylon, 4% Elastane

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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