Engineered Foot Protection

ST Inside
ST Outside
  • Constructed with THOR•LON® blended with thermal fibers for extra insulation , and 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.

  • Low profile toe seam won’t rub or irritate feet.

  • Ventilation panel for extra moisture control and breathability

  • Unique padding specifically designed for extreme cold weather activities, clinically shown to reduce blisters, pain, pressures, and moisture for maximum protection.

See the Outside
Beyond Socks

For Feet That Hurt

During or after your activity

Learn More
Beyond Socks

For Feet That Do Not Hurt

During or after your activity

Learn More

Your Feet Will Feel Better Or Your Money Back®

Snow Extreme Cold socks

Clinically-Tested Padded Socks For Feet That Hurt

Tested in The Toughest Conditions

Loved by snowmobile and dog sled racers, trusted by Canadian construction workers and Lake Superior ice fisherman, Thorlos padded Extreme Cold weather socks are the choice for those who play or work long hours in the cold. Alpaca socks – known for their warmth - are no match for our highly protective worsted wool-THOR-LON® blend over-the-calf padded socks.

Allergic to Wool? We recommend our Hunting Cold weather padded sock, which does not contain any wool. Click this link to see and read about the product.

“Socks, like other important gear, can make or break a day of ice-fishing or hunting deer. These socks allow me to put on just one pair and stay warm. I like them so much; I gave a pair to a trapper friend of mine, a bird hunter friend of mine, and my brother in northern Wisconsin. Each of them has thanked me several times and have inquired about how to order more.”  John F.


Built for Warmth and Comfort

Thorlos Extreme Cold Weather socks have been constructed to:

            Keep your feet warm…

Keeping your feet warm in frigid conditions requires the right thermal fabric. Wool for warmth is a given, but not 100% worsted wool. In a well-insulated boot, your feet will perspire. To keep them warm, it’s absolutely essential to blend the wool with our proprietary THOR-LON yarn; the blended fabric wicks perspiration away, keeping feet dry (and the skin of the feet healthier) during 8 to 10 hour days. Dry feet are warm feet. If your feet get wet, they will get cold more easily, which can start a chain reaction that  chills your entire body, causing you to shorten your work or play day and possibly putting your health (or life) at risk.

            Stay up all day long…

Out in the cold you need socks that will stay up over your calves all day long. If you’re wearing gloves and protective pants, you’re unlikely to be able to tug your socks up during the day. That’s why Thorlos Extreme Cold weather padded socks are made with a 4-inch long ribbed spandex knit secure-fit top. The top snugs comfortably to your calf, staying in place all day long.

            Keep your feet and legs comfortable…

Thorlos Extreme Cold weather padded socks are made with our engineered clinically-tested padding placed exactly where you need it. As always, you’ll find padding on the balls and the heel of your feet. It’s also been added where your feet require protection from your boots. You’ll find Thorlos clinically-tested padding across the top of the toes for protection and thermal insulation, across the top of the feet, around the ankles and all the way up the front of your legs to protect and insulate your shin.

All of this padding translates into:

-          blister reduction

-          pressure-point protection

-          more effective wicking of foot perspiration

And this translates into Profound Comfort®.


“Best socks I wore in my life, recommend for those who want high-quality socks really - really worth every penny. Not only are these warm blister free socks, they really support ankle & calves muscles. The double thick layer running up the shin is wonderful, as well as everything else about this sock. We have several different types of Thorlo Socks, but this is the one for cold weather motorcycling.” Mona P.


“The title say it all - great socks for warmth and comfort.”  Randy B.


“Besides being very warm for my cold feet in winter, they are super soft and comfortable.”  James H


“I just love these. All of the cushioning is great and in the right places.”  Elizabeth B.

Curious but not yet convinced whether Thorlos CTPS can help you address your foot pain? We invite you to try your first pair free…just paying shipping and handling.

Click this link to see our FIRST PAIR FREE OFFER.

Endorsed by the Alpine Institute  

If you are looking for additional assurance, we are proud to share that our Extreme Cold padded foot protection has been named “Guides Choice” by the American Alpine Institute. We hope we can add you to the list next!

American Alpine Institute Guide's Choice


“No other socks should even be considered during winter.”  Joseph P.


Thorlos Ultra-Light Padded Socks Make an Excellent Liner Sock

Formerly known as our Liner padded sock, our newly styled Ultra-Light Hiker is an excellent liner sock if you prefer this kind of additional protection. It’s available in two lengths:

            Over-the-calf:  ULHO    

            Crew length:  ULHX      



THORLO stands behind all its foot-protection products. Our 30-day brand promise: Your feet will feel better or your money back®!



Thorlos are proudly made in the USA. To learn more about our craft and commitment to retaining our manufacturing in the USA, we invite you to watch our video entitled “An American Brand Story.”



Reviews for Thorlos EXTREME COLD

  • 5 out of 5

    Style: EXCOU



    As a surveyor, I am outside constantly in the coldest climates Canada has to offer. I own both smartwool and thorlo winter socks and can't say enough good things about either. The thorlo extreme cold, however, wicks quite a bit better than the smartwool, thus leaving my feet a bit more comfortable at the end of a long day of hiking the tundra. I would like them to be around 2-4 cm longer so they don't slide down my leg as much. Keep up the good work Thorlo!!

  • 5 out of 5

    Style: EXCOU

    Comfort and warmth


    They feel soft yet long wearing. Will wear them most days this winter.

  • 5 out of 5

    Style: EXCOU

    Feels Like I'm Walking On Air


    The cushioning of these socks is awesome. From the moment I put them on I knew I would love them. The only complaint I have is that from time to time they do itch. It may be more me and less them so I won't knock them too hard over it. They were a great purchase!

  • 5 out of 5

    Style: EXCOU

    Very Warm


    Awesome. Deliver as advertised and a step up in warmth from my previous -40 rated Wigwam socks. Wore with poly liners at -30 camping for a week and toasty warm in Lacrosse Ice King boots. Hoping to try them in the -40 to -55 snaps we had this winter next season. Would buy again and the size fit as advertised too. I am allergic to wool and not itchy at all. Kept one pair drying while I wore the other.

  • 5 out of 5

    Style: EXCOU

    these socks are the best period.


    These socks truly are the highest standard second to none.I bought 3 pair from the store went back for more ,they were gone -bought another 3 online.I work outdoors full time and dont mess around when it comes to my feet.these socks hug and stay up over your calves) excellent in the arch ,wicks away moisture like you never felt thick and warm.recommended them to co workers they smile and tell me its like walking on clouds.They are pricey but well worth the cash. P.S. I never post but these socks/thorlo deserves it!

  • 5 out of 5

    Style: EXCOU

    comfort and warmth



  • 5 out of 5

    Style: EXCOU



    I had suggested to Thorlo that they should make the a Mountaneering sock, but LONGER and add more colors. And they did LISTEN: this new style is LONGER, and come in three colors. GREAT JOB THORLO! These are FANTASTIC and manage mositure better. SIMPLY THE BEST WINTER SOCK, WORTH EVERY PENNY! THANKS!

  • 1 out of 5

    Style: EXCOU

    not happy


    i bought 4 pair 2 years and love them ,,,but i wanted 3 more pair and now they are not the same,,,i got the largest size and they are to tight and these new ones are ichy also. tried to strech them out by stuff them with balled up socks. chris

  • 3 out of 5

    Style: EXCOU

    warm but not soft


    Not as soft as the snowboarding/ski socks I have purchased in the past from Thorlo.

  • 5 out of 5

    Style: EXCOU



    Who says the Marketing Department doesn't listen? I reviewed the ST Mountaineering socks on 3/4/14, praising the socks but criticizing the length because they were too short and not a true over-the-calf sock. Well, along comes the EXCOU Extreme Cold sock with a fiber blend essentially identical to ST Mountaineering (60% wool is all you need to know) that is -- wait for it -- THREE INCHES LONGER THAN "ST"! And, in a tour de force of sockdom, it's offered in three colors instead of just the battleship grey tinting ST. Well played, Marketing Department. Bonuses for all!