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ST Mountaineering Socks

Unisex over-calf

Clinically-Tested Padding for maximum protection
Lt. Grey


Designed for feet that hurt. Enjoying maximum protection in sub-zero weather, on all terrains including extreme summit conditions where foot protection is critical. Specifically engineered to deliver the maximum protection and comfort for any mountaineer prone to blisters, foot pain, or discomfort.

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Unique padding specifically designed for Mountaineering

Why Thorlos?

Watch and see how Thorlos clinically-tested padding reduces blisters, pain, pressures and moisture—and make your feet feel better, guaranteed.

What Independent Clinical Studies Say About Thorlos

Thorlos padding has been the subject of eight independent clinical research studies that were published in peer-reviewed medical journals. The results showed the proprietary padding reduces foot pain, blisters and other foot conditions, pressures on the foot and moisture.


  • 100% wool toe for maximum warmth, and low profile toe seam won’t rub or irritate feet.
  • Constructed with THOR•LON® blended with thermal fibers for extra insulation, superior softness, resilience, durability and moisture-wicking for drier, warmer, better feeling feet.
  • Cushioned instep and arch for a better fit, more support and less pressure on the feet for a more comfort.
  • Unique padding specifically designed for mountaineering, clinically shown to reduce blisters, pain, pressures and moisture for maximum protection.
  • Ventilation panel extra moisture control and breathability.

Product Details

  • Length: over-calf
  • Cushion: Thick Cushion
  • Fiber Contents: 60% Worsted wool , 27% Exclusive THOR•LON® Acrylic , 11% Stretch nylon , 2% Spandex
  • Care instructions: For longer product life, maximum protection and comfort, wash and dry inside out (to fluff up the pads) using liquid fabric softener after each use (to lubricate the fibers for longer life). For optimal benefits, liquid fabric softeners are always recommended. Do Not Bleach. Wash Normal: 105F/40C. Dry Normal Medium. Do Not Dry Clean. Do Not Iron.
  • Proudly made in the USA
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Thorlos Guarantee: Thorlos Brand Promise,
Your feet will feel better or your money back®.

49 Reviews

4.9/5 overall rating
  • 5/5

    Best for cold weather and comfort


    Ah! The Thorlo Mountaineering socks. I first came to know these wonderful socks as they were issued to us at the USMC Mountain Warfare School. You know if after decades of itchy wool socks these are what are being used there, they are the best. My feet loved them. They don't fall down, they give you cushion in all the right places, and they are warm even if a little moist. Expensive, sure. But, worth it. I wore out the ones I bought 7 years ago in the military, and just replenished my supply for ski/ hunt season in the Midwest. You won't be disappointed. I've tried many brands of cold weather socks, & these are the only ones which last and work.

  • 5/5

    Best socks ever! Love,love,love them !



  • 5/5

    Mountainerring socks



  • 5/5

    Perfect for over the timberline trekking


    I bought my first pair of Thorlo Mountaineering Socks close to 30 years ago and I'm happy to say the quality has stayed the same. In a time when most of our favorite brands have all gone downhill, Thorla continues to provide top quality socks. When I first started hiking I took a long time looking for a good hiking boot but didn't pay much attention to the socks. After complaining about blisters and sore feet someone recommended Thorlos so I (skeptically) gave them a try. I never wore another brand of hiking socks again. They really do deliver what they promise. If you want to actually get what you pay for then try these. They do not disappoint.

  • 4/5

    Too Short!


    I sat down to request an improvement by Thorlos, but before that I decided to read the reviews and see if anyone else had the same complaint. Danged if David D. didn't have the exact suggestion that I have: Increase the length of the sock about 1.5 inches. They are not true "over-the-calf" socks, so the fit, comfort and stay-up-on-your-leg-all-dayability is compromised. And don't think David's height is the problem -- I'm 2 inches shorter (5'-11") with 2 inches less inseam (34") than David, and the socks are too short for me, too. Hopefully the folks at Thorlos read these reviews and correct this one flaw in the product. I've been wearing the Thorlos Trekker socks for many years -- all day, every day. Weddings, funerals and church are about the only events that keep the Trekkers in the drawer. Even though the yarn mix in the Mountaineering socks is a bit different than the Trekkers (more wool in the long socks), they're pretty close. Just wish the Mountaineer was longer.

  • 5/5

    Best socks for work


    My son says these are the best. I buy them for him. He is on his feet all day and outdoors as well. He always complained about extreme pain in his feet. I bought him every brand sold. He tried them all. He only wants Thorlo's.

  • 5/5

    best for working.


    i love the feel of these socks,i have been wearing them for over fifteen years.

  • 5/5

    Warm and comfortable


    Best winter socks I've worn. Thorlo's buy 3 get 1 free is just icing on the cake. If you do a lot of outdoor activities in colder climates, these socks will fit the bill.

  • 5/5



    I use these socks for evenings at home - they provide relief to tired aching feet and ankles that I never imagined possible. I recomended them to a friend who is a profesional Chef and on his feet all day, and they are a new lease on life for him. Highly recomended, and not just for hiking ! !

  • 5/5

    make bad boots fit well and help my mother with her leg spasms


    I love these socks for their cushioning properties. They make my leather boots feel broken in. I put a pair of silk socks underneath them to totally remove all friction as I walk. My mother is 80 and she has frequent leg spasms. The warmth of these socks helps her greatly. Their cushioning helps her as well. I love your socks and have given them to my friends already as gifts.