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The Merino-blend SmartWool Women's PhD Running Light Micro Socks keep your feet cool and comfortable whether you're pushing yourself through grueling training sessions or blasting through race day. Thoughtful design and a minimalist approach work together to give these socks a barely-there feel while the smart blend of fibers helps keep your feet comfortable and dry.

  • Merino wool blended with nylon and a touch of elastane helps regulate temperature, wick moisture, and give you a great fit
  • Minimal design forgoes excess cushioning in favor of a natural foot-to-earth feel
  • Micro height hits just below your ankle bone to keep your legs feeling cool and carefree
  • Padded Achilles tabs protects the back of your ankles from blisters and abrasion

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Here's what others have to say...


Great socks

  • Familiarity:I've put it through the wringer
  • Fit:True to size
  • Height: 5'4"
    Weight: 121 lbs
    Size Purchased: Small

I bought them because after two hours of dance class I was suffering feet pain due to friction. I chose light and ultralight, both work as a charm. These socks are very soft, and breathable, they keep my feet dry and confortable. They are perfect!


Good for day hikes

  • Fit:True to size

I bought these socks for a trip to Yosemite for day hikes. Great cushion with a little extra coverage up on the ankle to help prevent rubbing and blistering. Actually, I wore these with a pair of hiking shoes that were not broken in yet and my feet felt great after 10 miles of hiking! Did not have any issues with blisters or excess moisture. I would recommend these if you like a little more softness to your sock and plan on needing it to get through a long walk/hike/run. They are durable and wash well without shrinking or warping of shape. Overall, great sock for the price and I love the Smartwool products!


Socks are too thick

    I expected the socks to be thinner than they are since they are running light micro socks. I may need the ultra light sock instead. Otherwise, these are well made, comfortable socks.


    Sock Snob

    • Familiarity:I've put it through the wringer
    • Fit:True to size

    I have tried soooooo many socks for trail running over the years, and these are hands down my favorite. Super comfy, soft, and they really keep the blisters away.


    Happy feet

    • Familiarity:I've used it once or twice and have initial impressions
    • Fit:True to size

    I took this out for a spin this morning and my dogs didn't bark, not even at a passing cat. These socks are colorful and fun, and I really like the fit (I'm a size 10.5-11 shoe and the L is great). The ankle is rolled and a bit more meaty in back, but that was actually nice and soft. I'm eager to try these socks on a warm morning when (eww) foot sweat might be an issue.


    Grab the poppy color!

      These socks are super light but very comfortable and cushioned. I can't get away from merino wool socks, they dry fast, don't hold odor, and keep your feet at a great tempature. Smartwool has very good quality, these socks will last you. Very durable! I do have a bit of a sizing issue with these socks. I wear size 5.5/6.0 US womens and the size Sm is a little bit to large.