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Designed to dampen vibrations during training, provide extra muscle support, and improve blood circulation to promote recovery, the SmartWool PhD Running Graduated Compression Ultra Light Sock delivers top-shelf comfort during your workout and beyond.

  • Graduated compression fit helps improve circulation and provides excellent support during your run or for your post-workout recovery
  • 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
  • 20-30 mmHg graduated compression rating

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Here's what others have to say...


Great compression!

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

I have multiple pairs of these socks. I'm a nurse and I am always on my feet while I work, and these socks help so much! The compression is perfect, and my legs are no longer as exhausted after a 12 hour shift. I highly recommend these.


Compression is real

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

If this sock were in my size, I would have it myself, but since they didn't, and the color is one my friend loves, I bought it for her. She wore them and said they looked great, felt great, and even got compliments on them. I asked how they felt, and she said they were a little tight, but I think that's because it's a compression sock, and it's supposed to be that way. :) I assume that means this sock is actually compressing, as it is supposed to. Wish they had it in my size!


Great Compression!!!

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

I started wearing compression sock for skiing and picked these up for all-around use (running, long days on my feet, travel, etc.). Great compression without seeming too thin like some other brands. Thus far, any issues with durability seem to be one-offs, and I haven't had any negative experiences. Plus, Smartwool and have awesome customer service.


Smartwool, great but expensive

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

I love smartwool, I've found their products fit me well and are extremely durable.

I purchased these socks with my credits, so they were free. I had never used compression socks, as I hadn't really understood the hype around it all. I figured I'd give them a try.

Honestly I can't tell much of a difference in performance, aside from the fact that having a little compression seems to have helped me recover from a slight ankle injury. The feel however is nice, really comfortable. Very durable, haven't noticed any wear and I've done about 200 miles in them. Not sure if it adds on any miles but I'd rather not rely on gear for that anyways.

I use these primarily on colder runs, or I'll keep them in my pack on longer runs when I need to change after I've completed any creek crossings for the day.

A nice addition to my smart wool sock collection, however as with most smart wool products I will never pay full price for them, hence the three stars.

What shoe sizes coordinate wit small, medium large, etc? Thanks!

This link should bring up the sizing chart


Don't just buy these, marry them.

  • Familiarity:I've used it once or twice and have initial impressions

These arrived tonight and I tried them on immediately. The only problem is now I don't ever want to take them off. I thought I was doing fine with my calf and ankle issues by wearing sensible shoes and light exercise and calf stretches, but now that I'm wearing these I realize just how uncomfortable my calves, ankles, and arches have been. Everything just feels better simply from wearing these the past few hours. I really wish I'd known about these when I first took up running or during the first of many attempts to recover from tendinitis. These seem like they may actually help me fully recover. I'm only giving four stars though, not five, because I haven't tried them long enough to attest to how well they work over the long-run. But in the short run, they feel awesome.


They performed great!

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

I purchased these while training for the Superior Trail 25k in Northern Minnesota. I have never tried compression anything before but bought these to relieve pain from medial shin splints I incurred while training (it's tough to get enough winter/spring running volume in MN). They allowed me to run completely pain free and I finished the race with no shin splint pain whatsoever.


Holy socks!

  • Gender:Male
  • Familiarity:I've used it several times

I think Smartwool needs to go back to the drawing board a little on their socks, including this pair. After only ONE WEEK, there was a hole in both toes. This is common with their other socks too. I'm done with this brand.

Been abusing Smartwool socks for a numbers of years. I have never had a problem with them and would recommend them to anyone.

I've worn these socks for a year now, mostly at work: long days on the feet. These are the best socks I've worn, hands down. Easy to get on as well, which most compression socks are kinda hard to get on.