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Welcome to the Smartwool PhD Running Light Micro Sock. The micro cuff provides minimal coverage while you tear down the mountain trail, ReliaWool technology pads the heel and forefoot to boost shock-absorption and durability, and non-itchy merino wool breathes well and helps prevent odors from accumulating.
  • Blended composition maximizes the benefits of each separate material while minimizing fabric drawbacks
  • Non-itchy merino wool breathes well, helps regulate body temperature, and is naturally odor resistant
  • Nylon components dry quickly, breathe well, and add extra durability
  • 4Degree Elite Fit system employs ankle, instep, and arch elastic bands for better stretch, fit, support, and circulation
  • ReliaWool tech on the bottom of the sock combines high-density impact zones along the ball and heel provides long-lasting protection
  • Virtually seamless toe construction limits irritation and chaffing

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Here's what others have to say...

5 5

Connor Bruson

Member since 

Got my first pair of Smartwools 5 years ago and have never gone back to regular socks since. The 'running light micro' is my favorite design. It's no-show and the lip on the heel prevents chafing. The 'light' weight seems to last a few months longer than the 'ultra light' weight socks - I get at least 1-2 years out of mine. I'd recommend the ultra light socks for minimalist running shoes or cycling, though. These are great for everything else - casual, hiking, running, etc! Wonderful product. Fill your sock drawer with 'em!

5 5

jdb4859448

Member since 

If you are used to the typical cotton or thin ASIC's running socks you will be in for a surprise. I ran cross country for over a year using typical cotton socks and then for another 4 years with the nice $15.00 Asic's thin runners socks. The primary problem I had was moisture build up and comfort. Then the asids took take of the moisture part and were a bit more comfy. The only problem I have from the asics was the odor control. Then I finally gave smart wool a try. As soon I I slipped them on I felt a tremendous difference and they took off from there. Excellent breathability, excellent warmth or cooling abilities, and no odor even when I whore them for 5 consecutive days running.

5 5

unbiased

Member since 
  • Gender: Male
  • Familiarity: I've used it once or twice and have initial impressions

I hiked 18 miles (in Chicago) as a trial for a planned hiking trip in New Zealand (Milford Trek) which spans 33 miles over 5 days. I felt very comfortable with these socks; you will want a sock liner to use with these type of wool socks, planning to use these with Salomon XA Pro 3D Ultra GTX shoes and the longer cousins of these type of smartwool socks with North Face Dhaulagiri II GTX which I simply love and wish they were still on the market!