Back to top

Please select a color/size.


  • Indestructawool construction strategically places merino and reinforcement fibers where they are needed most for remarkable durability and comfort
  • 4 Degree Elite Fit system features 2 elastics for greater stretch and recovery to keep the socks in place
  • Ventilating mesh ensures maximum breathability, thermoregulation and moisture management
  • Virtually seamless toes offer extraordinary comfort
  • 8.5 in. overall height is perfect for wearing with ankle-high hiking boots

Made in USA.

Save 10%

When you buy 3 or more pairs of full-price socks.

Shop socks

Discount will be applied when you check out. Offer not valid for sale-price items ending in $_.3 or $_.9.

View all Smartwool Men's Hiking Socks

REI membership


Best Use Hiking
Fabric 56% merino wool/41% nylon/3% elastane
Sock Height Crew
Sock Cushioning Light Cushioning
Gender Unisex
Rated 5 out of 5 by from Most durable, comfortable socks I have owned! A couple of years ago, I began purchasing Smartwool socks for three reasons: I wanted wool socks to keep my feet warm, I wanted durable lightweight socks I could wear with nice work clothing, and I wanted socks that lasted more than a month without getting holes in the toes. Smartwool socks in general fulfill all of those. The PhD Outdoor Light Crew Socks are part of the Indestructawool line, and they are fantastic! They are lightly cushioned, provide some arch support, feel great on my feet whether I have my shoes on or whether I am lounging in my house, and feel like—as the name suggests—they will be indestructible. While I can't wear them in my "dress-up" work shoes, I wear these socks whenever else I can. They are comfortable, feel substantial, and keep my feet warm and dry.
Date published: 2017-01-11
Rated 5 out of 5 by from best socks I've ever had I bought 2 pairs for a 500+ mile hike thru VT,NH,ME on the AP trail. They were great. After 6 weeks on the trail they still look almost new. Yes, I did get blisters, I blame the boot and myself for them, not the socks. 9 days was the longest time between washing, no foot ordor!
Date published: 2016-09-14
Rated 4 out of 5 by from Great Socks I was looming for my old favorites with the orange and red detaing around the heel and toe. Seems they've switched up the colors, but the socks are still great, snug, and warm for biking through Chicago winners. Lol
Date published: 2017-01-06
Rated 5 out of 5 by from work socks great socks have pads right where you want them they make your boots more comfy
Date published: 2016-02-22
Rated 5 out of 5 by from Extremely comfortable I bought a couple pairs of these socks for a big backpacking trip in the Grand Canyon. They were phenomenal. I didn't develop any blisters for the entire week, my feet were comfortable, odor free, and the socks dried out extremely quickly after hiking in the rain for an entire day.
Date published: 2017-05-15
Rated 5 out of 5 by from These are the best socks I have had several pairs for over a year now. If I can help it, SmartWool PhD socks will be the only socks I ever wear again. They are the most amazing, comfortable sock I've ever put on my foot. I cannot recommend them enough. It was magic from the first time I slipped m foot into them.
Date published: 2017-03-24
Rated 2 out of 5 by from Elastic may be too tight. Did not realize that the elastic in the sock would be so firm as to leave impressions in my ankles/lower calfs after a few hours of wear. Rolling down simply reduces the circulation to my foot and causes a little numbness. Good looking socks but not the most comfortable.
Date published: 2017-04-05
Rated 4 out of 5 by from Great Product Bought this a few months to use on my Mountain bike trips.. I've used it a few times, and it works great, kept my feet warm and toasty. Soles are thick and appear to be well made.. overall a quality product
Date published: 2017-04-16
  • y_2017, m_5, d_19, h_8
  • bvseo_bulk, prod_bvrr, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_17
  • loc_en_US, sid_894205, prod, sort_[SortEntry(order=RELEVANCE, direction=DESCENDING)]
  • clientName_rei-inc
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • CLOUD, getReviews, 42ms

Traveling a lot. Will this sock dry overnight?

Asked by: Norse
Merino wool is known for being quick to dry and have the ability to wick moisture. You should expect these socks to dry overnight depending on the climate.
Answered by: REIservice
Date published: 2017-01-18

do they come in crew length

Asked by: jerrysc
​These socks are crew length.
Answered by: REIservice
Date published: 2017-05-03
  • y_2017, m_5, d_19, h_11CST
  • bvseo_bulk, prod_bvqa, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_2
  • loc_en_US, sid_894205, prod, sort_[SortEntry(order=NUM_ANSWERS, direction=DESCENDING)]
  • clientName_rei-inc
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • CLOUD, getContent, 38ms