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Doctor’s Orders.

Dialing in the fit of your running shoes was a process, and you can’t go messing it up now by getting thick clunky socks that’ll mess up the whole thing. Better to rock Smartwool’s PhD Outdoor Ultra Light Women’s Micro Sock, which has a super-thin profile and virtually no seams to fit comfortably under high-performance shoes. When everything fits this well, the miles fly by and blisters are relegated to the realms of memory.

  • These ultralight socks are key when a perfect fit isn’t an option
  • Smartwool’s PhD system is designed for high performance regardless of activity
  • Merino wool and strategic elastic fibers manage moisture, prevent rubbing, and last virtually forever
  • Mesh ventilation zones keep your toes cool on even the toughest trails
  • Reviews
  • Q & A

Great socks for sweaty feet

  • Familiarity: I've put it through the wringer

Smartwool doesn't itch, and absorbs moisture like a champ.

Great socks

  • Familiarity: I've used it several times

Awesome socks

Learn More: Smartwool PhD Socks

Learn more about the comfort, fit, and durability of Smartwool PhD performance socks. #gofarfeelgood

Perfect for Hiking

  • Familiarity: I've put it through the wringer

These are great for hiking and trail running. They are comfy and breathe well. They stay in place and don't slip off your ankle. In additional, they have held up well over the years.


  • Familiarity: I've used it several times

I bought these for the girl, she said socks and I said smart wool! she loves wearing them with running shoes or hiking! They aren't a noshow sock but pretty close so they are just right for her nikes. they are very comfortable and just padded enough that she can wear them with booties as well. All good things to say! She always wears them and loves the dark gray color.

Perfect for Hiking!

    My Fiance reports that these are comfortable, thin and breathable! I love how the back is a little higher so it doesn't fall down my heel, which helps prevent annoyance and blisters.

    Great Socks!

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

    I bought these because I kept getting really bad blisters while hiking and needed a comfortable sock that would cover my ankle. I have a couple pairs of SmartWool ski socks and love them so I knew that I would love these too. They're super comfortable and breathable and have made hiking much more enjoyable.

    Happy Feet!

      I've worn these socks a few times for different activities and have no complaints. Per usual with Smartwool, they're very comfortable and very breathable. My feet haven't gotten too hot and the socks stay put (no bunching/slipping/sliding). They've held up great after a few uses and a few washes.

      why bother with any other brand?

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

      smart wool is AWESOME!! Light weight and warm. Keeps feet warm even with sweat or any moisture. I love how this particular model is a little higher in the back...its perfect for long hiking days, since its a little higher in the back you never get irritation or blisters on the back of your ankle.

      Great socks

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

      I love these socks, I already have plenty of them because they take care of my feet during hiking :); they do not move and dry quickly.
      Regarding the sizing I am between S and M, in the past I bought the medium one and it fits ok but I little loose, I have experience that with the ultralight socks so I recommend to go down and choose the small one.