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Mountaineering Extra Heavy Crew Sock

Out of Stock  Product Number: 284

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The Smartwool Mountaineering Extra Heavy Crew Sock features extra-heavy cushioning which will keep your feet warm and dry when you're mountaineering, ice climbing or multi-day backpacking. Arch brace holds the sock in place, and a flat-knit toe seam will keep you comfortable.

* This product does not qualify for shipping to all countries.


  • Starts with the finest grade of Australian Merino wool (considered the Cashmere of Wool), specially selected and treated with the revolutionary SmartWool process – removing the microscopic ends of the fibers which are the cause of "shrinkage"
  • The fibers in the sock contain up to 2,000 porous membranes per inch – when knitted into socks, these tiny membranes create literally millions of microscopic air pockets which are the key to thermo-regulation (temperature control and evaporation of moisture)
  • The Merino wool fibers used in SmartWool socks are also longer than other conventional wool sock fibers, this extra length creates a knitted yarn that is itch-free and silky soft to the touch
  • Knitted so only 100% wool touches your skin, with stretch nylon and Lycra® supporting the outside for resilience
  • Top: 2 x 1 rib welt top with nylon holds the sock up and in place - high density padding assures a comfortable, snug fit and shin protection
  • Ankle Brace: Increased fit above the ankle - prevents slippage, Instep: High density padding protects against lace pressure
  • Side Panel: Flat knit reduces compression - provides better fit and maximizes ventilation
  • Arch brace: Knit with nylon for increased support and comfort
  • Sole: Very high density padding cushions against shock, blisters and abrasions
  • Easy care – machine wash and dry
  • 100% Guaranteed not to itch or shrink and to outperform all other socks or send them back to Duke Designs within 30 days for your money back

Gender: Unisex
Material: 80% Merino Wool, 19% Nylon, 1% Elastane
Fit: Crew height
Season: F14 F15
Vendor ProductId: SW133
Review ProductId: 284


by PowerReviews
SmartWoolMountaineering Extra Heavy Crew Sock

(based on 2 reviews)

Ratings Distribution

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Reviewed by 2 customers

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warm warm little piggies

By edward teach

from cumberland plateau

Staff Reviewer


  • Comfortable
  • Cushy
  • Warm
  • Wicks Away Moisture


    Best Uses

    • Around basecamp
    • Around the house cabin
    • Backpacking

    Comments about SmartWool Mountaineering Extra Heavy Crew Sock:

    these socks are great. really warm even when wet. i wear them around the house and take them on all my fall through early spring camping trips. they are great to just keep your little piggies dry and warm.

    • Fit:
    • Feels true to size
    • Was this a gift?:
    • No

    (2 of 2 customers found this review helpful)


    Whoa, seriously comfortable socks.

    By NewYorkPaul

    from New York City

    About Me Casual Adventurer

    Verified Buyer


    • Comfortable
    • Cushy
    • Durable
    • Good Design
    • Regulates Temperature Well


      Best Uses

      • Any cold-weather activity
      • Backpacking
      • Daily Use
      • Hiking
      • Mountaineering
      • Travel

      Comments about SmartWool Mountaineering Extra Heavy Crew Sock:

      In the winter, I wear these around the house just because they're so friggin comfortable.

      • Fit:
      • Feels true to size

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