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J Running Socks

Unisex rolltop

$13.99 - $14.99
Clinically-Tested Padding for maximum protection


Designed for feet that hurt. Enjoying short but intense runs or going long distances on all terrains, in most weather conditions resulting in moderate to significant stress on the foot. Specifically engineered to deliver maximum protection and comfort in the critical strike zones for any runner prone to blisters, foot pain or discomfort.

Product details below
Color: white/platinum
Shoe Size

Please select a gender first

Unique padding specifically designed for Running

The Design of Thorlos Padded Running Socks

Insights into the design, development and testing of Thorlos activity-specific, clinically-tested padded running socks from David Varsik, THORLO's senior design engineer.

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.


  • Constructed with THOR•LON® fibers for superior softness, resilience, durability, and moisture-wicking for drier, better feeling feet.
  • Cushioning over the toes to help protect against runner’s toe.
  • Flat knit instep and cushioning in arch for better fit, more support and less pressure on the feet for a more comfortable run.
  • Low profile toe seam won’t rub or irritate the feet.
  • Unique padding specifically engineered for running, clinically shown to reduce blisters, pain, pressures and moisture for maximum protection.

Product Details

  • Length: rolltop
  • Cushion: Thick Cushion
  • Fiber Contents: 86% Exclusive THOR•LON® Acrylic , 13% Stretch nylon , 1% 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
Select your gender and size

Thorlos Guarantee: Thorlos Brand Promise,
Your feet will feel better or your money back®.

506 Reviews

4.9/5 overall rating
  • 5/5

    CEO, The Industrial Athlete, Inc.


    As an exercise physiologist and dedicated runner for the past 40 years, I give Thorlo rolltops ("the J") my highest endorsement and recommendation. I discovered Thorlo rolltops back in the early 80's. I have worn no other ever since; running, working, leisure (unless having to don a suit and tie); even during Michigan winters. Their cushioned sole provides terrific padding and they wear like iron. During my years as a hospital sports medicine department director and today, as CEO of a corporation providing corporate fitness/wellness management and industrial injury management services, I am always recommending Thorlo socks; especially "the J." How do I feel when I wear the J? Comfortable and energized!

  • 5/5

    love the low cut on ankle


    like the styling and the comfort.

  • 5/5

    Great socks for walking!


    I use them for daily walks with dog. We average 3 miles every morning and the extra padding means my feet don't hurt when we are done.

  • 4/5

    Very comfortable


    The socks are very cushioned but slightly too thick for my current walking shoes.

  • 5/5

    Love my socks


    I love my Thorlos - they're the only socks I use when exercising. Very comfy and durable.

  • 5/5

    Slipper substitutes


    I wear these without shoes around the house after showering and rubbing foot cream over my heels and toes - much easier to launder than slippers.

  • 3/5

    It's a shame you changed them


    I have been buying these from you for over 10 years and am disappointed in my latest purchase. It's obvious that the sock is smaller and much less material is used in the production. I'm sure it's to save money and to avoid having to raise the price due to rising costs, but it's readily apparent and the sock actually feel too small is the size I have been wearing forever.

  • 5/5

    Roll Top Running Socks rule


    It is a lightweight and very comfortable sock. I have been using them in hot weather for more than 20 years and see no reason to stop.

  • 5/5

    best socks for any activity



  • 5/5

    25 years and counting


    I've been running in Thorlos for over 25 years and the J has been part of my wardrobe for most of that time. That should give you an idea of how I feel about these socks.