Smartwool Mountaineer Extra Heavy Crew Socks

The Smartwool Mountaineer Extra Heavy crew is a thick merino wool sock designed for use in extreme environments. Ideal for winter mountaineering, ice climbing and trekking in cold climates.

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Smartwool Mountaineer Extra Heavy Crew Socks Video


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You Pre-Order is prioritised (at no additional charge); meaning that, as soon as the product arrives with us, we can wrap it straight back up and get it sent out to you - it often never even hits the stock room shelves!


With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

Estimated Delivery Dates

Estimated Delivery Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery Dates provided on product pages.

The Current Estimated Delivery Dates for Smartwool Mountaineer Extra Heavy Crew Socks is

Smartwool Mountaineer Extra Heavy Crew Socks Description

  • Brand : Smartwool
  • Season : Perennial
  • Code : 5004749
  • Weight : 0KG
  • The Smartwool Mountaineer Extra Heavy crew is a thick merino wool sock designed for extreme environments.  

    These Merino wool socks offer unrivalled warmth and protection in cold conditions with extra-heavy full-cushioning for comfort over extended periods. An arch brace holds the sock in place and adds additional support. The flat-knit toe seams reduce the risk of blisters and the deep woollen pile inside wicks any moisture away from your skin.

    Smartwool Mountaineer Extra Heavy Crew Socks Deep Zoom

    Buyers Guide

    Sizing Information



    • S = UK 2 - 4.5
    • M = UK 5 - 7.5
    • L = UK 8 - 10.5
    • XL = UK 11 - 13.5

    Technical Information

    • Extra-thick 3 x 1 knit with over-the calf design provides extra protection and a snug fit
    • Natural Merino wool features long, silky fibers for extra warmth and comfort without wools itchiness
    • High-density sole padding cushions against shock, blisters and abrasions;
    • High-density padded insteps and shins protects against lace pressure
    • Incorporates Smartwool's WOW (Wool On Wool) technology for better comfort and durability
    • Lycra spandex arch braces for increased support and comfort
    • Ribbed welt top and Lycra spandex braces above the ankle help keep socks up for a wrinkle-free fit and less chance of blisters
    • Flat-knit side panels add breathability and ventilation to keep feet comfortable
    • Fabric: 90% wool/10% stretch nylon

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    1 Customers Reviews this as 5
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    • Smartwool Mountaineer Extra Heavy Crew Socks Review

      By Carmen on 5
      These socks are fab for winter walking and climbing. Since buying a pair I always reach for these first on cold winter days. Being merino they are also less smelly than other socks.
      YES Carmen would recommend this item