FREE SHIPPING
Free Shipping! On Orders Over $50 Details.
But fear not - there is plenty to explore...
Shop all Darn Tough Shop sale Darn ToughMEMBERSHIP
EASY RETURNS
Take up to a full year to return your item! See our Return Policy.
LOWEST PRICE GUARANTEE
Find a better price? We’ll beat it by 5%. See our Price Match Policy.
Made with a high percentage of Merino wool and a thick cushion for all-day comfort on the trail, the Darn Tough Mountaineering OTC Heavyweight Socks are designed for hardcore hikers and climbers who depend on their feet to get them there. With a 73% Merino Wool, 25% Nylon, 2% Lycra® Spandex composition and classic Darn Tough seamless comfort, these are the socks you want to be in for the long haul.
73% Merino Wool / 25% Nylon / 2% Lycra® Spandex
Heavy Weight
Over the Calf Height – The name says it all. The ultimate height for keeping the outside out.
Heavy weight terry loop cushion
Fast Action Wicking – Pulls moisture away from skin. Fast drying.
Fine Gauge Knitting – Unprecedented durability and our unique “put it on, forget it’s on” feel.
Guaranteed For Life – No strings. No conditions. For life.
Merino Wool – Darn Tough's custom count, shrink-treated Merino wool enhances the comfort and durability that outdoor enthusiasts have come to expect from this fiber.
Naturally Antimicrobial – Repels bacteria and odors.
Performance Fit – From form fitting toe boxes to sculpted heel pockets and integrated arch support, Darn Tough's knitting techniques produce the finest fitting performance sock available.
True Seamless™ – Undetectable seam fusion for an ultra smooth, invisible feel.
Made in Vermont, USA