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The Heavyweight Mountaineering sock was built to be our warmest sock for winter mountaineering. On the coldest days, when you can't even imagine going outside, this sock will become your best friend. A perfect fit for any cold-weather exploration, frigid adventure, or just shoveling the driveway snow, it delivers time and again. Don't get caught without them!

Fabric

Fiber Content: 80% Merino Wool, 10% Nylon, 9% Stretch Nylon, 1% Spandex
Total Easy Care: Machine Wash and Dry
Wool Source: Australia
Made in the USA.

Features

Height: Full Length - For when you need a sock that comes all the way up to the knee.
Weight: Heavyweight
Full Terry: Warm merino cushioning throughout the sock
Full Foot Plating: Extra durability on the footbed
Seamless Toe: Smooth, comfortable finish on the toe
Weight: Size Large = 5.6 oz. (159 grams)
Style #: 9402

Uses

Ideal Seasons: Fall, Winter
Activities: Indoor Wear, Camping, Ice Fishing, Hunting, Snowsports, Cold Weather Outdoor Work

Care

Washing and Drying Instructions - Learn more about wool care

Machine Wash Cold: Gentle cycle with like colors
Detergent: Mild or wool-specific
Tumble Dry: Low heat
Storage: Place in an airtight container when not in use for long periods of time
Do NOT Use: Fabric softener or bleach!

Guarantee / Warranty

30 Day Satisfaction Guarantee - Return Policy
5 Year Manufacturers Warranty - Learn more about our 5-year New Hampshire-made sock warranty
Excellent Quality - Customer Service

Benefits of Merino Wool

Moisture Wicking
Merino wool is the best fiber to regulate moisture. It does this by absorbing sweat from your skin and releasing it into the air. Whether you're hiking, running, biking, on the job, or just relaxing at home, our wool helps keep you dry and comfortable all day long.

Soft & Comfortable
Merino wool fibers are much finer than traditional wool, creating a luxuriously soft feel that won’t itch or irritate your skin. Comfortable enough for everyday wear and gentle enough for sensitive skin, it’s a natural choice for underwear, base layers and next-to-skin comfort.

Highly Breathable
Merino wool’s unique structure allows air to circulate freely, helping to regulate your body temperature in both hot and cold weather conditions. Whether you're layering up for winter or staying cool in summer, Merino keeps you comfortable by letting your skin breathe.

Anti-Microbial
Merino wool naturally resists odor-causing bacteria, keeping you fresher for longer. No lingering smells, even after extended wear. Perfect for travel, outdoor adventures, and everyday life.

Insulates When Wet
Merino wool can hold up to 30% of its weight in moisture without feeling wet or clammy against the skin. Unlike cotton or synthetic fabrics, it keeps insulating when damp, making it a smart choice for unpredictable weather and high-output activity.

Fire Resistant
Merino wool is naturally fire-resistant and self-extinguishing. It will not melt or stick to your skin like synthetic fabrics. A trusted option for first responders, campfire safety, or any high-heat environment.

UV Protection
Our Merino wool clothing helps protect you from the sun’s harmful rays, with different levels of UPF based on fabric weight:

Microweight (145 GSM): UPF 20
Lightweight (170 GSM): UPF 25
Midweight (245 GSM): UPF 50+
Heavyweight (400 GSM): UPF 50+

These natural UV-blocking properties make Merino wool ideal for long days or the beach or above treeline.

Renewable and Sustainable
Merino wool is a natural, biodegradable fiber with a low environmental footprint. Grown by Australian Merino sheep and shorn seasonally, it is a renewable material that supports responsible farming practices.

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