PhD Pro Endurance Krar Print Crew Men's



Smartwool athlete and ultrarunner Rob Krar came to Smartwool to make a sock that can handle the longest trail runs. Introducing the PhD® Pro Endurance Krar Print Crew. 

This running sock features Indestructawool™ technology for enhanced durability, a Virtually Seamless™ toe for added comfort, and a 4 Degree™ elite fit system for a dialed, performance-oriented fit—so you can stay confident on the most rugged trails. And body-mapped mesh zones keep things breathable mile 1 to mile 100. 

Get ready to rack up more miles than ever before.

  • Sock Height: Crew
  • Rob Krar signature sock
  • Indestructawool™ technology for enhanced durability
  • 4 Degree™ elite fit system for a dialed-in, performance-oriented fit
  • Shred Shield™ technology reduces wear from toes
  • Body-mapped mesh zones for added breathability
  • Virtually Seamless™ toe for enhanced comfort
  • 7.5" overall height
  • Made in USA of Imported Yarn: 57% Merino Wool 38% Nylon 4% Elastane 1% Polyester
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