Darn Tough- TACTICAL Boot Socks | Heavyweight with Full Cushion


Extreme Cold Weather/Mountaineering boot sock designed for extreme cold climates or rugged terrain. This is our warmest sock, featuring full terry loop cushioning throughout for maximum warmth. Elastic support at arch. Reinforced heel and toe for increased durability.

  • 80% Merino wool
  • 19% Nylon
  • 1% Lycra
  • USAF Safe to Fly Certified and NAVAIR SOA Approved.

Size Chart

Sock Size Shoe Size
Men/Unisex Women Men's US Women's US
S M 5.5 - 7.5 7.5 - 9.5
M L 8 - 9.5 10 - 11.5
L XL 10 - 12 12 - 14
XL - 12.5 - 14.5 -
XXL - 15 - 17 -


  • Performance Fit: No slipping, no bunching, and no blisters.
  • Fine Gauge Knitting: Unprecedented durability and our unique “put it on, forget it’s on” feel.
  • Fast Action Wicking: Pulls moisture away from skin. Fast drying.
  • All Weather Performance: Cool in the summer, warm in the winter.
  • Guaranteed For Life: No strings. No conditions. For life.
  • Merino Wool is fast drying, breathable and odor resistant for all-day comfort.
  • True Seamless: Undetectable seam fusion for an ultra smooth, invisible feel.


  • Boot socks sit mid-calf for added protection and warmth. A sturdy companion.
  • The clear choice for extreme cold environments, heavyweight socks in the Tactical category are also considered the best for rugged terrain.

Cushioning Details

  • From the toe to the top cuff, full cushion Tactical socks have terry loops running the length of the sock for a full profile of comfort and protection.

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