Engineered Foot Protection

TRMX Inside
TRMX Outside
  • Constructed with THORLON® blended with THOR•WICK® COOL fibers for superior softness, resilience, durability and extra moisture-wicking for drier, cooler, better feeling feet.

  • Cushioned instep and arch for a better fit, more support and less pressure on the feet for a more comfortable run.

  • Unique padding specifically engineered for trail running, clinically shown to reduce blisters, pain, pressures and moisture.

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

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®

Outdoor Trail Running socks

A Sport that’s Tough on Your Feet

Trail running’s popularity is exploding—it’s a great form of exercise and an opportunity to meet personal challenges and surpass personal “bests.” But running up and down trails, pounding the rocks, slogging through dirt and mud, kicking up dust and dealing with the whims of the weather all take a toll on your feet. In fact, the Institute for Preventive Foot Health/NPD 2012 National Foot Health Assessment has shown that after marathoners, trail runners are more likely than any other sport enthusiast to experience foot conditions, especially blisters

“I walk/run on a dirt/gravel road and was looking for a way not to feel all the rocks in the road. These socks are so good at cushioning that I want to wear them all the time on our farm.” Phileta R.

The Right Gear is Key

Staying on your feet and on the trail requires more than good conditioning. It takes gear that’s comfortable, protects your feet and won’t let you down. Painful feet or a blister will slow you down and take a lot of the joy out of your excursion. The right shoes are important, and many manufacturers now offer a variety of all-terrain shoes to choose from. But shoes are only part of the story for off-road running. The right padded socks are also critical—and here you have only one choice if you want the best possible foot protection and comfort: Thorlos clinically-tested (CTPS) trail running socks. They will protect your feet inside your running shoe and out—the top of the padded sock has a special, one and a half -inch, snug-fit ribbed top to keep dirt and debris from entering the padded sock as you run.

“I've run thousands of miles with these trail running socks, and have tried numerous other types of socks made for trail running; these are hands down the best. The moderate cushion (medium thickness) is perfect for all conditions.” Todd S.

How Thorlos Help

Thorlos clinically-tested padding provides your feet with maximum protection. It helps reduce impact from rocks, dirt and other trail debris, and the shear forces that can lead to blisters and other injuries to the skin and soft tissues of your feet during a trail run. Made of made with our exclusive THORLON yarn and THOR•WICK® COOL fiber, Thorlos also wicks moisture away better, further protecting against blisters and other foot conditions that could interfere with your comfort and enjoyment.

“Used these with new hiking boots in August. No blisters!” Linda J.

Clinically-Tested Padding

Thorlos clinically-tested padded trail running socks are recommended if you experience foot pain or want to help prevent any foot conditions during or after running. The padding is placed precisely where your foot needs protection, and has been clinically shown to reduce blisters, pain, pressures and moisture:

Ball and heel padding: Protects the ball of the foot from the shearing and impact forces that occur while running on rough terrain. 

Toe padding: Protects against banging of the toes in the front of your trail running shoe when you’re going downhill.

“They are extremely comfortable and provide the necessary support in all of the right spots of your feet. Amazing is all I can say and is the reason I bought more and will continue to buy more as long as Thorlo continues to offer them.” Eric P.

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.

Thorlos Lite Padded Socks

If your feet don’t hurt during or after trail running, we recommend our Experia® brand, which provides more protection and comfort than other thin socks on the market. Experia comes in 12 colors and offers lightweight protection with an aerodynamic fit.

30-Day Guarantee Brand Promise

Our promise to you: Your feet will feel better or your money back®!

“The cushion is great for trail running. Cheaper socks just do not protect the feet on rough dirt trails like Thorlo socks do.”  Ken O.

Reviews for Thorlos TRAIL RUNNING

  • 5 out of 5

    Style: XCCU

    They got it right!


    Great fit, padding where needed. You know how some of these low cut socks slide around your foot or slip down--not these. They stay put. My feet are wide--4E--so I was concerned on fit; they are snug--not tight at all. After a month, they seem to be durable as well.

  • 2 out of 5

    Style: XCCU

    XCCU uncomfortable


    They are uncomfortable on my feet. Where the padding stops on the underside of my foot (which I'm flatfooted) is causing discomfort.

  • 3 out of 5

    Style: XCCU

    good for tired feet


    good but I have only worn them twice and the tops have unraveled

  • 5 out of 5

    Style: XCCU

    best walking, jogging or leisure socks i have ever owned


    no sore feet, even after five or six miles. feet seem cooler, seems to eliminate aches or pains.

  • 3 out of 5

    Style: XCCU

    Too wide at the toe seam


    I've worn Thorlos for a long time but had given them up when the no-show style took over and I looked dorky in my white mini-crews. I had been wearing some regular thin fitness socks but saw these and thought I'd give them a try. The toe seam is too wide, too stiff, and too bulky. When I wore them they made my little toe bone sore from pushing up against the shoe. I have narrow feet and these just didn't conform well to my foot there but made a lump. I was happy to be able to take them back to the store. If it wasn't that they didn't fit I bet they would have been great as Thorlos usually are.

  • 5 out of 5

    Style: XCCU

    Best socks for bottom of feet


    Great except they tend to go down into the shoes. They are the best that I have had

  • 5 out of 5

    Style: XCCU

    Best biking socks I have ever owned.


    Excellent cushioning for the heel and ball of the foot and great arch support.

  • 5 out of 5

    Style: XCCU

    Best Socks EVER!


    Love these socks. I wear them to run. I wear them to walk. I wear them to work. I have juvenile diabetes and have always been particular about the socks I wear. I have 10 pairs of these now and wear them daily.

  • 4 out of 5

    Style: XCCU

    Great overall socks


    I like these socks, much better than cheaper brands. Still I have problems with my feet, very sensitive but at least and improvement over other socks

  • 5 out of 5

    Style: XCCU

    Great socks....


    Love these socks. Great comfort, great colors. Wish the price was a little cheaper.