Designed for extended cold weather activities in extreme environments.   This is the cutting edge of warmth technology!

HEIGHT: Overcalf

CUSHION: Sole & Shin Heavy

CONTENTS: 86% Polartec® Powerstretch®, 6% Polartec® PowerDry®, 4% Thermolite®, 3% Nylon, 1% Stretch Nylon with LYCRA®



Designed for extended cold weather activities in extreme environments. This is the cutting edge of warmth technology!

Based on feedback we received from professional mountaineers and cold-weather athletes we learned that most wool socks on the market were too constrictive and maintained moisture during their activities. This can be dangerous in parts of the world where a wet foot can lead to hypothermia or other serious conditions. Our design team wanted to solve this problem by creating a sock that would be incredible warm and dry. We searched the globe to find materials and a construction process that provide the perfect combination of elasticity, support, and warmth.

Two Layers of Polartec® Power Stretch on the outer layer of the sock provide warmth without increasing weight. The smooth outer layer is wind- and abrasion-resistant; the soft inner layer pulls moisture away from your skin keeping you dry, warm and comfortable.

A layer Polartec® Power Dry® keeps your skin dry when you sweat. Features a patented bi-component knit construction that uses different yarns on either side of the fabric. This creates two different surfaces: one that is optimized to move moisture away from the skin, the other to dry quickly.

Special sizing applies to these socks. Please check sizing chart.

Additional information


Grey, Deep Forest


Small, Medium, Large, X-Large