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Smartwool Mountaineering Extra Heavy Crew

11 reviews   |  

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Charcoal Heather

This is Smartwool's most heavy-duty outdoor sock.

When you're going to extremes like mountaineering ice climbing and long backpacking treks you'll thank SmartWool that you wrapped your feet in these. Heavyweight cushioning throughout the sock provides extra comfort insulation and protection for extreme conditions.

Elasticized ankle brace holds heel in place and allows for less bulk and greater forward flex in the boot. High Density Footbed (HDF) for improved performance comfort and durability. Midcalf height is 2 inches taller than Expedition Trekking or Hiking socks.


  • Flatlock seam construction to eliminate chafing. 
  • Extra heavyweight cushioning throughout the sock provides extra comfort insulation and protection for extreme conditions. 
  • Machine Washable. 

Colour: Charcoal/Heather (as shown)

Materials: 75% SmartWool 21% nylon 4% elastic.

Sizing (UK)
S/2-4.5 - M/5-7.5 - L/8-10.5 - XL/11-13.5


  • Age Group: Adult
  • Fabric: 75% SmartWool 21% nylon 4% elastic
  • Cushion: Heavy
  • Sock Height: Crew
  • Gender: Unisex
  • Manufacturer: Smartwool
Customer Reviews
4.7 Based on 11 reviews
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Filter Reviews:
    Ole S.
    Great socks

    I strongly recommend these socks for winterbuse!

    Laura D.
    United Kingdom
    Brilliant socks at best price here

    These socks are just brilliant. Needed to replace the pairs I’ve been enjoying for a couple of years now. Great to find them at a really good price at Rock+Run, and service was great too. Highly recommend.

    Karl M.
    United Kingdom
    Great socks

    these are great socks, very warm. I used them up Elbrus is 60km winds with a pair of Nepal Cubes and they kept my feet toasty warm. Highly recommend.

    Euan S.
    United Kingdom

    Great socks, very comfortable for a long day in the mountains.

    Marc W.
    Great socks, last forever and

    Great socks, last forever and a day! Use mine day in day out. Bought a pair for my wife now!