Model Number:

The Smartwool PhD Medium Crew Sock comes from Smartwool's Oudoor line. It has a higher Merino Wool content and is thicker than their pure run socks. This means these socks offer a padded feel and the higher Merino Wool content provides greater odor resistance. As such, these socks are good for travel when you may not be able to wash the socks between runs.


*Formerly named Smartwool Trail Running Socks



  • Medium thickness, full-length cushion absorbs impact and increases comfort
  • 4Degree Elite Fit System combines 2 elastic types paired with wool for greater stretch that improves performance fit
  • ReliaWool Technology at High Density Impact Zones reduces shock and abrasions while increasing durability
  • Mesh zones for ventilation and comfort
  • Flat knit toe seam increases durability
  • SmartWool inside for natural moisture, temperature and odor control
  • 3.75" tall quarter-cut


  • 71% Merino Wool / 27% Nylon / 2% Elastane

Sock Performance Characteristics

Sock Thickness What's this?

  • Extra Thin
  • Thin
  • Medium
  • Thick
  • Extra Thick

Sock Height What's this?

  • No Show
  • Low
  • Quarter
  • Crew
  • Knee High

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