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  • SmartWool PhD Outdoor Medium Crew Sock Navy
  • SmartWool PhD Outdoor Medium Crew Sock Charcoal

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  • SmartWool PhD Outdoor Medium Crew Sock Navy
  • SmartWool PhD Outdoor Medium Crew Sock Charcoal

SmartWool PhD Outdoor Medium Crew Sock

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    30 Reviews


    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
    • Item #SWL0769

    Tech Specs

    72% merino wool, 26% nylon, 2% elastane
    Recommended Use
    hiking, backpacking, casual
    Manufacturer Warranty
    2 years

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    Best Hiking Socks

    • Familiarity:I've put it through the wringer
    • Size Bought: S & M

    These Socks are perfect for hiking anytime. I also use them snowboarding/snow-shoeing in the winter. The SmartWool PhD line has a great weight for any time of the year, and I pick the Medium even in the summer. The cushioning is so comfortable and it wicks moisture well enough that even in high-temps I don't get sweaty or experience blisters. I wear size US 6 -6.5 in shoes, and have worn these in Small and in Medium no problem. The last thing I love about these socks is that they stay true to form and keep there elasticity even after several years of use. Keep it up SmartWool!

    THE best socks

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

    This is THE sock. I've used many wool and synthetic including other Smartwool brand socks. The PHD Medium Crew is my favorite by far to date.

    Recently used them on a 10 day trip to Peru hiking in the mountains every day and finishing with a 4 day backpacking trek. No smell and feet stayed dry. I wore the same pair most days and every day of the trek with a second pair for sleeping and emergency.

    The PHD do not bunch and stay in place where they should. The padding in the heel and toes are perfect for my taste. Wore them with Gore-Tex Vasque Sundowner boots.

    This is my new favorite sock by far. 5 stars. The only question I can't comment on is durability as I have not owned them long term.

    9.5 foot. Size large purchased. Great fit.

    Happy Feet

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

    These socks will make your feet happy. They are warm, breathable and wicking, which means dry happy feet. These socks do the trick no matter what you throw at them. If you are climbing 14,000 peaks in Colorado, these socks will be perfect. Spending the day in the office? These socks can do that too. Smartwool really does know how to make the perfect sock. Pick up several pairs, your feet will thank you.

    Favorite socks I own

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

    After just a month, these are my new favorite socks. Warm, comfortable, and quick-drying, you can't really do better. Definitely a keeper for snowy or slushy conditions around town.

    This. Is. Comfort.

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

    I've bought two pair of these socks after an unsuccessful Patagonia sock purchase, and I'm really happy I abandoned my loyalty for Patagonia for this purchase. These socks are very comfortable, they keep your feet warm and dry. I've put 5+ miles in these a few times already and they've held up very well.

    I also have BIG calves and these fit just fine, which is always a worry for me.

    A quality sock!

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

    I have been wearing SmartWool socks exclusively for years now. When I first started wearing them only the "classic" looking hiking type varieties were available. They have always been very comfortable and their durability has exceeded my expectations. The SmartWool guarantee has always made me a confident consumer. Any company that says "send them back if you're not satisfied." is worth doing business with in my book.

    I was so excited when the Phd line was introduced - it gave so many more performance options. These have become my favorite sock for every activity from sitting on my butt in the office, to climbing 14ers, to 100 mile bike rides and everything in between.

    Thanks for making such an amazing product, SmartWool - and thank you for standing behind your product!

    buying smartwool is a smart decision

      I got these socks after I got the smartwool light crew socks which I liked but didn't have enough cushion. These keep my feet feeling awesome and fresh. They are a thicker sock so i thought they would be too hot for summer use but they do surprisingly well no mater what the temperature. I wear them when I use my hiking boots backpacking and they keep my heals from blistering on long days.

      Holy smoke! What a reaction!

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

      I bought these socks for my dad. The dude is 80 years old and when I looked though his sock drawer he had, like 8 pairs of nasty, trashed socks. So I bought him a stash of socks. Holy crap, man, he loves these! And in 83 years, I'm guessing he has worn a lot more pair of socks than most people reading this review. Here's what he had to say. "These socks are so comfortable. I love the fact that they breath so well. The material over the top of the foot really breaths well. They hug my foot in a way that was only matched by that little lady who comforted me in the depths of the Korean war!" Listen to your elders. I even got excited about the sock. In my opinion its a bit heavy, even for a "medium weight" and I prefer socks that go just above the ankle. But listen to my dad, in hindsight his advice has been spot on. Oh yeah, and he wears a size 14 shoe and the XL was perfect.

      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).

      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

      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 :-)

      Warm and Cozy

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

      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.

      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

      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.

      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.