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SmartWool Women's PhD Run Ultra Light No Show Socks

Style: SW185
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Get all the moisture and temperature regulation benefits of Merino in a no-show silhouette in the SmartWool Women's PhD Run Ultra Light No Show Socks.

Complete with SmartWool's 4 Degree elite fit system, women's-specific mesh ventilation zones and a virtually seamless toe.


  • 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

  • Lowest profile run sock available

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

  • Sock Height: Hidden
  • Care: Machine Wash Warm Gentle Cycle. Do Not Bleach. Tumble Dry Low. Do Not Iron. Do Not Dry Clean
  • Knit in USA of Imported Yarn: 51% Merino Wool, 45% Nylon, 4% 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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