Free 2-Day Shipping on Orders Over $50

Detail Images

  • Smartwool - 3/4 Back
  • Smartwool - PhD Run Ultra Light Low Cut Sock - Graphite
  • Smartwool - PhD Run Ultra Light Low Cut Sock - White/Light Gray
  • Smartwool - 3/4 Back -

Current Color

  • Smartwool - PhD Run Ultra Light Low Cut Sock - Graphite
  • Smartwool - PhD Run Ultra Light Low Cut Sock - White/Light Gray

Smartwool PhD Run Ultra Light Low Cut Sock

25% Off
sale from $12.00 $16.00

Free 2-Day shipping on orders over $50. Learn More

Select a Size:

Select options
  • Select options
    • M
    • L

    Select a Color:

    Select options
  • Select options
    • Graphite
    • White/Light Gray

    9 Reviews


    That's one smart sock.

    SmartWool's PhD Running Ultra Light Low Cut Sock earned its degree in technical performance with a minor in the utmost comfort. ReliaWool technology uses merino wool for ultralight temperature regulation, natural odor-resistance, and long-lasting durability. SmartWool's 4 Degree elite fit system uses elastic bands at the ankle, upper instep, lower instep, and arch for greater stretch and recovery. This smart sock also features a virtually seamless toe and mesh ventilation zones for extra comfort.
    • ReliaWool technology
    • Naturally antimicrobial
    • 4 Degree elite fit system
    • Mesh ventilation zones
    • Virtually seamless toe
    • Item #SWL00AH

    Tech Specs

    55% merino wool, 41% nylon, 4% elastane
    2.25 in
    Recommended Use
    Manufacturer Warranty
    2 years

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    PhD for the Win

    • Familiarity: I gave it as a gift but have feedback to share

    Bought these for a friend, he had this to say:
    Favorite sock for warm weather running - great balance of cushion, breathability, cut, and feel inside the shoe (no slippage). Not to mention the freedom from funk that comes with Merino. Great socks.

    PhD makes all the difference

      I would agree that at first I was a little skeptical and thought it was just a way to add on some extra cash to the price tag. But once I tried them out, I immediately realized it really does make a difference in how the sock forms over your foot and adds to the performance. I highly recommend them.

      No heel slipping!!

      • Familiarity: I've used it several times

      Not a runner, but I wore these with some trainers at the gym to replace some old "no show" socks that slid off my heels and these did the job. No heel slipping here! They were so thin I could barely feel them, but i did miss the toe and heel cushioning- personal preference. My feet did not get too hot or sweaty. SmartWool did a great job on the moisture wicking and temperature regulation. They have been through a couple of washes and still feel like new! will be buying more.

      Good cut

      • Familiarity: I've used it once or twice and have initial impressions
      • Fit: True to size
      • Size Bought: M
      • Height: 5'8"
      • Weight: 160lbs

      Most of Smart wool sock cut is either to low like the mini one or very high crew socks. This is more like normal 3-4 seasons cut, high enough to cover my base layer bottom and not too high and not too warm like crew socks only made for winter. This is more natural cut socks. I like it.