Heaviest merino wool sock - Charcoal Heather
Woolx Extreme - Heavyweight Cold Weather Boot Socks Charcoal Heather
Woolx Extreme - Heavyweight Cold Weather Boot Socks Charcoal Heather
Woolx Extreme - Heavyweight Cold Weather Boot Socks Charcoal Heather
Woolx Extreme - Heavyweight Cold Weather Boot Socks Charcoal Heather
Woolx Extreme - Heavyweight Cold Weather Boot Socks Charcoal Heather
Woolx Extreme - Heavyweight Cold Weather Boot Socks Charcoal Heather
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extreme socks outdoors
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extreme sock toe detail
bottom of extreme sock
extreme socks charcoal heather

Extreme Extra Cushion Over The Calf

104 reviews

$35.00 Regular price
  • Free shipping & Exchanges (US Orders)
  • In stock, ready to ship
  • Inventory on the way
  • Moisture wicking & quick drying
  • Breathable for all day comfort
  • Antimicrobial - Destroys odors
  • Built tough for extra durability
  • Ultra smooth seamless toe
  • Warmest & thickest sock in our line
  • Lifetime LOVE Guarantee
  • Built for hunting and adventuring
  • Over Calf Height
  • Plush Merino wool cushioning
  • Extra heavy terry loop construction


  • 78% Australian Merino Wool, 17% Nylon, 3% Polyester, 2% Lycra Spandex
  • Non-Mulesed Wool
  • Woolmark® Certified


  • Heavyweight


Follow these tips for the best performance and longest life for your garment:


Machine wash cold inside out and Tumble dry low.


Avoid fabric softener. Though it won't damage the clothing it does coat the fibers in a wax that neutralizes many benefits of Merino.

Extreme conditions require extreme insulation.

Say hello to the ultimate cold weather sock! Your feet have never felt warmth like this before.

78% Merino wool fabric with thick cushioning and arch support to provide incredible insulation & comfort in intense cold conditions.A

ll the wool you need, for every adventure you find.

Style #X599

Over the calf fit. Nice stretch for easy on and off but retains its shape.

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Fast Shipping!

All orders ship within 24 hours from our Endicott NY Warehouse

Free Shipping & Exchanges

Order worry free with fast free shipping and free exchanges.

Satisfaction Guaranteed

Every Woolx purchase is backed by our money back guarantee.

Talk To A Real Person

Need help? Call us toll free and talk to a real person! 888-465-7977

model wearing extreme socks and boots

Over Calf Height

Tall socks that extend over the calf in order to ensure warm and dry feet and legs during any activity!

image of extreme socks


These socks can be worn multiple times before washing, with no odor at all!

man wearing extreme socks

Maximum Comfort

These socks have additional merino cushioning to maximize comfort and warmth!

The warmest sock that you can find!



Need to buy another pair.

"I bought these for my husband. I will need to purchase another pair because this pair gets worn and washed over and over again. He LOVES them. The go over the calf and keep his legs very warm. He works in a warehouse, so it is very cold in the winter. Great socks."



"Got these for tree stand hunting in Pa. Have used socks in temps down to mid 20’s using rubber boots and these socks definitely helped keep my feet comfortable. Also like the over calf fit as well."


Warm, comfortable socks

"I am over the top with these socks I just purchased. It has been very cold here in Illinois and I am glad I have these socks. They have kept my feet warm on my walks even when it has been 0 and below. They do not bunch up and don't rub anywhere. Great product."

Woolx Customer Service Rep



Our customer service team is right here in the US and ready to answer your questions via email, chat, sms, or phone...that's right...a phone where you can talk to a real rep right here at our Endicott, NY location!

Model wearing a Woolx Easy Care Tee


First off, you don't need to wash your Woolx merino clothes anywhere as much as you wash cotton or synthetics.

You can wear this weeks at a time without smelling reducing waste of water and detergents not to mention time!

When you are ready to freshen up your garment just toss it in the wash on cold and tumble dry low. That's it! You'll be back in your Woolx in no time!

Merino shirts laid out for travel.


Once you travel with Merino you'll never go back. Read on to see why...

Pack less and travel light! One bag in the overhead and one under the seat. Freedom!

Avoid the lines.Once you travel without having to check luggage you'll never want to go back!

Wear weeks without laundering.Merino wool doesn't retain odors so you can wear your items weeks without laundering.

Always look sharp.Merino fabric resists wrinkles like no other fabric so take that nap on the plane.

Girl in Australia with Sheep


• Our merino wool suppliers only use Wool from farms that participate in the ethical treatment of their animals, and this includes humane shearing practices.

• All wool used to make Woolx clothing is CERTIFIED NON-MULESED and only comes from farms that absolutely do not practice mulesing.

• All of the wool used to create Woolx clothing comes from Merino Sheep in Australia and is Woolmark certified.

Customer Reviews
4.8 Based on 104 Reviews
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Tami D.
United States United States

Top of the line!

Love Love. Coming back for more !!!

Rebecca A.
United States United States

Great socks!

These socks are great. Thick, comfortable and very warm!

sherry f.
United States United States
I recommend this product


these socks while thick are not bulky to wear. i wear them around my home and appreciate the sensation of having my calves warm all day and evening. the wool is not scratchy, but rather the socks are soft inside. i find when i keep my calves warm during the day, my legs are not as restless at night and i am able to sleep better.

Heidi D.
United States United States
I recommend this product

My dad loves these socks!

I bought a pair of these socks for my dad (he has suffered from severely cold feet and extremities since I was a kid) after I realized how much I greatly benefited from owning a pair and how warm my feet were when I wore them. I'll include a brief snippet of the message he sent me after wearing these awesome socks: "In the last few days and nights I have experienced profoundly improved sleep quality and quantity! If that were the only metric for the WoolX product, it would be an overwhelming win/win conclusion! I was amused to discover in the early morning hours this morning that while it was not uncomfortably cool inside the apartment bedroom, I found myself kicking off the blankets covering me! This is an unusual thing for me to be doing as being toasty is a very big deal for me these days! Thanks again and hurray for WoolX, as they are changing the oftentimes weary late nights for the fortunate ones that have found relief through their amazing thick and woolly socks!" I am so thankful I found WoolX and their superb products!

Judith F.
United States United States
I recommend this product

Warm, heavyweight wool

These have a thicker yarn and density than the heavyweight version from Duluth. These are more money, but if you want the heaviest weight, then these are worth the extra cost. My wife has the same socks. However, they do not extend over the calf. They should be taller.

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