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Run smarter not harder.

The Smartwool Women's PhD Run Ultra Light Micro Sock has just enough sock at the ankle to shield you from cuff on ankle rub but is still lightweight enough to keep you light on your feet. In addition to the the natural breathability of merino wool, mesh ventilation zones promote further ventilation, so you never feel the sweats in your feets. 

  • Merino wool, nylon, elastane blend
  • Reliawool technology
  • Mesh ventilation zones
  • Ultralight weight

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SmartWool PhD Run Ultra Light Micro Sock - Women's

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Here's what others have to say...

5 5

Super socks

  • Fit: True to size

I'm very happy with these! They're thin but not wimpy. Slide easily into my shoes. High quality socks and excellent fit! I want 5 more pairs.

5 5

Cool Socks!

  • Familiarity: I've used it several times
  • Fit: True to size

These socks are wonderful! Lightweight and breathable, even in hot and humid North Carolina summers!

5 5

Brilliant long lasting sock

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Height: 5' 2"
    Size Purchased: Small

I have purchased these in the past and had to get some more. They are great for using in your tenny's. My feet swell at any hint of heat and especially if I'm moving so these socks are great as they are thin enough to allow for swelling and they wick and keep my feet dry! I love the tab on the back - which helps prevent possible blister prone people/or the shoe that might give a blister because of where it sits on your heel. My last pair I had for about 3 years, and even then they were still functioning. I didn't have holes, and maybe by the end of my exchanging out the heel was a tiny tiny tiny bit thinned, but not really. They were still usable. I highly recommend these and think these are worth the investment. Well made and this season has great colors which I as a color lover really really like.