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No matter what your profession, if you choose to upgrade your foot cover to the SmartWool PhD Outdoor Medium Crew Sock for cool-weather backpacking, hiking, or strolling, then consider yourself a doctor of smart decision-making.

  • Blended composition maximizes the benefits of each separate material while minimizing fabric drawbacks
  • Soft 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 a snug fit, support, and circulation
  • ReliaWool tech on the bottom of the sock combines high-density impact zones along the ball and heel for long-lasting protection
  • Mesh zones allow heat and moisture to escape quickly to promote faster drying to reduce swamp foot
  • Virtually seamless toe construction limits irritation and chafing

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SmartWool PhD Outdoor Medium Crew Sock

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Here's what others have to say...

5 5

Its like a sock on steroids!!

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

Very comfortable sock, while the support bands do not seem like much, I tend to notice the difference on 20+ mile day hikes between the phd and the regular crew. That little bit extra support keeps your arch from collapsing when the stabilizing muscles get tired and you're on your way back to the car. Bottom line they handle the abuse, and last a long time. Ive had the same 3 pairs for 5 years and they still look new after washing them.
Perfect gift idea for the outdoors person on your Christmas list. Although they cant eat it like all the candy you give them, this still makes a perfect stocking stuffer.


Difference from the regular hiking- For really long day hikes (covering a lot of miles) or quick hikes I prefer the Phd version of this sock. Same idea as the regular hiking sock- just with some support bands and a little thinner sock. I use the regular hiking socks for backpacking type trips. Anything where I am going to be moving at a slower pace or hiking with a bigger pack (adds a little more cushion).

4 5

Good but no awesome

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

These indeed are cozy socks, keep you warm when regular socks don't, but that's all, maybe only the benefits when wet have more to do, but for us people with wet feet feel really strange

5 5

BEST SOCKS EVER!!!!!!

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

Oh my... my feet love these socks! The midweights are perfect for ~30*F hiking. I haven't had the chance to test them much outside of that though. Feet were nice and dry after a pretty decent 7mi hike :-)

5 5

Treat your feet right.

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

These socks fit great and feel great on my feet. If you haven't indulged yourself you should try at least one pair. You won't be disappointed.

5 5

Warm and Cozy

  • Familiarity: I gave it as a gift
  • Fit: True to size

I bought these socks for my brother in law for a Christmas present and according to my sister he is a very happy camper with these socks. I got him some lightweight crew-cut SW socks for business wear and then these for active wear and it turned out to be the perfect combo. It has been an especially cold winter in Washington D.C. and he says these socks are a pleasure to wear out on a brisk night's dog walk or stroll in the park! He wears a size 10.5 and they fit him perfectly!

5 5

Wooly bully

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

Great socks smart wool is alway a great go to sock.

Wooly bully
5 5

Best Sock Ever

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

I love wool socks and have tried many. The Smartwool Phds are hands down the best, most comfortable sock on the market. They last a long time and are good to use on the longest of backpacking trips to the longest of days in the office and everywhere in between. They are always the first socks I grab out of the drawer. Shame about the high price....

5 5

Stellar ski sock

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

I got one pair for christmas years ago and since then I've started a collection. These socks are perfect for under any type of ski/snow/snowboard boots. They have these awesome vents above the base of your toes that let the sweat out and these crazy elastic bands that make your feet feel like they're athletic-taped with bands of awesome. You can even wear these as every-day socks in the winter without your feet filling your shoes with sweat. It's like turning your sneakers into slippers!

5 5

Great socks

  • Familiarity: I've put it through the wringer

These are high quality socks. The PhD style are designed to fit more securely with the idea that they wont slide around in your shoes. So these socks will fit tighter, but as long as you don't throw them in the dryer, Smartwool's sizing recommendations are spot on.

The merino wool blend on these socks is very breathable, wicks well and dries quickly. The also have great durability and don't pill up when washed. My feet run hot, and the medium weight is a bit too warm for me from mid spring through late fall, but I love them when the temperature dips! Those with normal feet would probably like them for everything but the summer.

Would these work well inside fishing waders...

Would these work well inside fishing waders in the summer? What's the PhD stand for? Is there something different about them? I need a pair for winter fishing as well as a pair for summer fishing with potential for a few miles and full days on my feet.

Best Answer Responded on

Matt that's exactly what I use my Smart Wool Phd med crew socks for. They work very well. I bought six pairs soley for this purpose. They keep my feet warm, don't bunch up, and are very comfortable.

Responded on

I've got a couple pair of medium and heavy pad socks coming. I bought a set of the light padding ones last week and love them. Thanks for the advice!

Responded on

Should be good in the water. Might be too warm for the hike out though. PhD is their line that is supposed to fir and stay in place the best.

5 5

Real Men Love Socks

  • Familiarity: I've put it through the wringer

Keep your feet happy with a pair of these SmartWool's. A great go to 3 season for everyday activities, but they will be a bit warm in summer temps.

Durable, comfortable, worth every penny.

Do these socks generally fit tight or...

Do these socks generally fit tight or loose? I usually wear 8.5-9 shoe size, should I go up to Large or down to Medium? Thanks!

Best Answer Responded on

Hey comp301623,

Thanks for the question. I have a few Smartwool socks and I would size up on the SmartWool PhD Outdoor Medium Crew Sock as I've had mine shrink a bit over time. This is most likely due to me drying them using heat after washing which does shrink merino products depending on how much heat is used.

Responded on

I have found Smartwools sizing to be spot on. The PhDs are designed to have a tighter fit so they stay in place, so i would recommend the large. For lifestyle models, probably medium. Like Wally says, you should line dry them: if you found them to be a little too big, you could toss them in the dryer.

5 5

tough socks

I got these after my brother told me I had to buy these socks. He wore this same pair on deployment and they never wore out.

5 5

Excellent Sock

  • Familiarity: I've put it through the wringer

These are some of the most comfortable and durable socks I have owned. The support is perfect the thickness works great for me. They are warm and the venting on the top has kept the sweat factor down in all climates when coupled with an appropreate eVent or GoreTex shoe or boot.

I have had these now for 4 years and they are as comfortable today as the day I bought them. The elastic is holding up to the point that they still feel as new as the day that I opened them. Daily wear, Back packing the AT or just about anything you would throw at them these are my go to socks!

Hike On !

4 5

Comfy

Great fit and plenty of warmth when matched up to quality boots.

5 5

I would buy them all if I could.

  • Gender: Male
  • Familiarity: I've put it through the wringer

If your only sock experience has been the ten-pack bag of white cotton socks from Walmart for $6.99... do your feet a favor and buy these. You won't be disappointed. Durability, comfort, style; this sock has it all!

5 5

Love Smart Wool

  • Gender: Female

I'm sold on Smart Wool socks. They are worth every penny. Very comfortable, warm and not bulky.