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SmartWool Men's PhD Run Ultra Light Logo Crew Socks

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From marathon training to fall trail runs, the Smartwool Men's PhD Run Ultra Light Logo Crew Socks will help you stay cool, dry and focused on your run, not on your feet.

The PhD Run Ultra Light Logo 's crew height protects against road and trail debris; Indestructawool technology provides ultimate durability. Non-cushioned.


  • 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: Men’'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


  • Sock Height: Crew

  • Run-specific fit

  • Virtually Seamless toe

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

  • 8.5" overall height

  • 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: 46% Merino Wool, 49% Nylon, 5% Elastane

(Men's Shoe Size Reference)

  • S: 3-3.5

  • M: 6-8.5

  • L: 9-11.5

  • XL: 12-14.5

Smartwool Socks Sizing

U.S. Men's Shoe Size3-5.56-8.59-11.512-14.5
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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