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Thin and lightweight Smartwool Women's PhD Running Ultra Light Mini Socks feature Smartwool's unique system that pairs merino wool with synthetic fibers for a snug, performance feel. Merino wool naturally wicks moister to fight blisters and resists odor build-up. The Ultra Light thickness features no added cushion underneath, but is plenty durable and protective thanks to high-density fibers at the heel and forefoot.


  • Poppy (829)

Important Shipping Note: U.S. sales only.


  • Medium-thin sock with no added cushion underfoot
  • 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
  • SmartWool inside for natural moisture, temperature and odor control
  • 3.75" tall quarter cut


  • 54% Merino Wool / 42% Nylon / 4% Elastic

Customer feedback

Comments: These socks are not durable. The toes are worn through and I have only had them a few months. I expect a lot more out of a $14 pair of socks.
From: Charlene, Columbus, WI

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