SmartWool Merino Wool Trekking Heavy Crew Unisex Socks, Grey

Product information

These SmartWool socks over heavy, full-cushioning to provide shock absorption, insulation against the elements and support under heavy loads.

An arch brace holds these SmartWool Trekking socks in place, adding additional support for your foot as well. A flat-knit toe seam adds to your day long comfort, ensuring you don't get blisters from chafing.

Size guide:

  • M - 5-7.5
  • L - 8-10.5
  • XL - 11-13.5

As well as new socks, why not get some new underwear?

Eligible for International Delivery
80% merino wool, 19% nylon, 1% elastane
Pack Size
Single Socks
Washing Instructions
Machine washable

Brand information

The Smartwool Difference - Pushing the boundaries of Merino

The Smartwool story started on a rugged Colorado ski slope with the belief that toes didn’t have to be cold. One simple pair of Merino socks challenged the conventional wisdom and forever changed the way outdoor enthusiasts looked at their feet. It’s not just about the Merino, though. It’s what they do with it that makes Smartwool different. For over 20 years, Smartwool have been pushing the boundaries of Merino to create smarter, more capable products from head to toe.

SizeUK Shoe SizeU.S. Men's Shoe SizeEuro Shoe SizeCalf Circumference (Largest part of the calf)
S2-4.53-5.534-4711"-14.5" (18-26.5 cm)
M5-7.56-8.538-4112.5"-16.5" (32-41 cm)
L8-10.59-11.542-4514.5"-18" (37-45.5 cm)
XL11-13.512-14.546-4916"-23" (41-58 cm)
SizeUK Shoe SizeU.S. Women's Shoe SizeEuro Shoe SizeCalf Circumference (Largest part of the calf)
S2-4.54-6.534-4711"-14.5" (18-26.5 cm)
M5-7.57-9.538-4112.5"-16.5" (32-41 cm)
L8-10.510-12.542-4514.5"-18" (37-45.5 cm)
XL11-13.5N/A46-4916"-23" (41-58 cm)

The measurements shown on the size chart are body measurements. These are average measurements for guidance to determine which size is right for you.
Please note, actual measurements may vary slightly by style.



If you’ve changed your mind about keeping your purchase, please return it in its original condition with proof of purchase and we’ll exchange or refund it. Unless faulty, this should be within 35 days of receiving your order. By original condition, we’d expect this to mean that you’ve kept packaging and labels, and that the item is undamaged and unused.

You can return for free in the UK via John Lewis shops, Royal Mail, Collect+ or MyHermes. If you need to arrange collection of large or heavy items, call us on 03456 049 049. For international returns queries, call us on +44 1698 545 454

You’ll find returns information on your delivery note. Exceptions apply to certain products - find out more about our refund policy

Q & As


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