Thorlo Outdoor Fanatic Socks

Color: Navy
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Designed for backpacking, trail running, speed hiking, or canyoneering the Outdoor Fanatic socks are made to help you reach the peak. Thorlo's Outdoor Fanatic socks deliver natural odor reduction with the use of Copper-Ion technology--a secret weapon when you're on trail and miles from a washer and dryer. No-rub toe seam won't irritate toes. Added venting and blended PrimaLoft wool encourage moisture wicking away from feet as well as increased temperature regulation. The Outdoor Fanatic sock has compression-grade arch and ankle support for tendons and plantar fascia. Added benefit? A comfortable, bulk-free fit that stands up to the pull of hiking boots. One sock does all approaches, maximizing your outdoor experience with Thorlo's Outdoor Fanatic.


  • Unisex Sock
  • Crew Height
  • Designed for speed hiking, backpacking, canyoneering, peak bagging, and trail running
  • Moderate Cushion
  • CuTEC Copper-Ion Technology: Copper yarns provide odor reduction and anti-fungal properties
  • Low profile toe seam won't rub or irritate feet
  • Flow-Thru venting: Ventilation panels in the arch and instep for better airflow
  • Impact Protection: Integrated variable loop padding for enhanced protection without the bulk
  • Strategic Support: Form fit with compression-grade ankle and arch support protects plantar fascia, fights fatigue, and prevents bunching and twisting
  • Sculpted, contoured light padding protects ankle bones
  • Shear Reduction: Special friction-reducing yarns for durability and skin protection
  • Performance Fabric: Blended PrimaLoft Merino wool with siliconized polyester for insulation and wicking throughout
  • Made in the USA

Customer Reviews

Based on 16 reviews

Great fit very comfortable for moving around and climbing stairs and ladders and walking about

H.B. (Tryon, NE)
All I wear!

I have worn Thorlos for about 15 years now. They last a long time and more importantly, they fit. They don't get eaten by slip on muck boots and I have walked quite a few miles in them. These socks are my new favorite. I've been wearing them for a couple of years now. They are warm in winter and cooler in summer. They fit perfectly and don't lose their shape and get stretched out after wear or washing. They are snug. You definitely need to get the right size. I wear a men's 8-8.5 or a women's size 10 and the med fit perfectly. Incidentally, I have 6 pr of these socks that, as mentioned, I've been wearing for a couple of years. I'm purchasing more because I'm sure they will eventually wear out. 😊

D.G. (San Francisco, CA)
The perfect socks

These Thorlo Fanatic's are exactly what my brother in law needed to motivate him to "get out and do it" to loose weight. Thank you very much, Douglas Gardali

F.A. (Kennewick, WA)
Excellent quality sock. FIt me

Excellent quality sock. FIt me well lengthwise, a shoe size 10. Too short for an 11 or a 12 foot. Very snug.

E.C. (Ridgefield, CT)
Comfortable and sturdy!

Comfortable and sturdy!