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by Smart Wool
gray and crimsongray and crimson
SKU: Smart Wool-SW133-410-XL



Extra Heavy Cushion

Extra-heavy full-cushioning keeps your feet warm and dry when you're mountaineering, ice climbing and multi-day backpacking. Arch brace holds the sock in place and adds additional support. Flat-knit toe seam keeps you comfortable. Made in the USA of New Zealand Zque™ Merino wool.

$ 17.95
$0.00 Save 20%

Quantity:  2+ Items 
Price: $80.00

Mountaineering Specifications
Weight per pair 5.1 oz (145 g) - Large
Contents 83% Wool, 16% Nylon, 1% Elastic
Height Crew
Cushioning Extra Heavy Cushion
Mountaineering Sizing
  U.S. Men's U.S. Wmn's Euro UK
Small n/a 4 - 6.5 34-37 2 - 4.5
Medium 6 - 8.5 7 - 9.5 38 - 41 5 - 7.5
Large 9 - 11.5 10 - 12.5 42 - 45 8 - 10.5
X Large 12 - 14.5 n/a 46 - 49 11 - 13.5

Mountaineering Features
SmartWool Mountaineering Socks
  • WOW technology in reinforced sole for maximum comfort and durability
  • SmartWool Fit System with arch and annkle support
  • 2×1 rib knit cuff
  • Sizing clearly indicated on sock
  • Flat knit toe seam
  • Elasticized ankle and arch braces


Advantages of SmartWool
  • Evaporates Moisture: SmartWool absorbs moisture from the skin into thousands of micro-porous cells where it is broken down into vapor and evaporated.
  • Insulates: Because of the natural crimp of each fiber, SmartWool contains millions of microscopic air pockets that give it “loft.”  These air pockets create an insulation layer that can block out cold or heat, leaving a dry layer of air next to the skin. Nothing insulates better than dry air.
  • Itch Free: The Australian Merino wool fibers used in SmartWool socks are longer than other conventional wool sock fibers. This extra length creates a knitted yarn that is itch-free and silky soft to the touch.
  • Odor Control: Because of SmartWool socks' ability to control and evaporate moisture, they inhibit foot fungus and offensive odors.
  • Cushining: The Merino wool fibers used in SmartWool socks are known for their ability to cushion and retain their “natural crimp.” This results in reduced shock and superior cushioning that maintains its natural shape for many years, unlike socks made of lesser quality wool.
  • Blister Control: The evaporative and cushioning properties of SmartWool provide for excellent blister control.
  • No Shrinkage: SmartWool socks are put through a special process which removes the microscopic ends of the fibers which are the cause of “shrinkage” in standard wool products.