Go further, stay comfortable. Designed for long days hiking in extreme terrain and conditions. Easy on the foot, but tough on cold, sweat, heat, moisture. Slightly lighter weight than our Trekker socks, but still "Seriously warm-Surprisingly soft", our newest extreme sock, that will keep your feet warm and dry all winter long. Ultra-soft bison fiber that has been properly processed, no prickly itch from these socks. Thicker and more cushioning than our Pro-gear socks.
This sock has a terry loop padded footbed, and lighter ribbed construction all the way up the calf with just enough spandex to hold it above your 10" boot top...but not enough to cut down circulation. Nylon over-plaited in the toe and way up past the heel for long smooth wear.
Superior breathability, temperature regulation, and natural odor resistance!!
Sock Sizing
Socks should fit as well as any of your other garments. The heel should sit on your heel and not under it as in a sock too small, nor half way up your Achilles as in a sock that’s too large. Socks should be flush against your foot with no extra material sagging. The toe seam should lay flat across the top of the toes.
Sock Heel at Your Heel
The sock heel should sit on your heel, not under it or above it.
Flat Toe Seam
The toe seam should lie flat along the top of your toes, not above or below.
Taut Across the Foot
Socks should be taut across your foot with no sagging material.
If you wear a wide shoe size (E+), consider sizing up.
| Shoe Size | US Men | US Women |
| Small | – | 3 – 6.5 |
| Medium | 7 – 9 | 7 – 10 |
| Large | 9.5 – 11.5 | 10.5 – 12.5 |
| X-Large | 12 – 14 | – |
Care Instructions
Machine wash warm. Then tumble dry. No need to bleach, iron or dry clean.
Once you are ready to clean your gear, follow a few simple steps to care for your favorite socks, beanie, and gloves.
How to Care for your favorite bison fiber gearMaterial Composition
Here at The Buffalo Wool Co., our yarn bases for all our gear is (and will always be) natural fibers. This means that the internal structure of your socks (the parts that touch your skin) will be made from bison fiber, merino wool, mulberry silk, and other 100% natural fibers.
The overall composition (the parts that touch your skin plus everything else) will include other materials like nylon or polyester. This is done to make the sock more durable and ensure that your socks work (and play) as hard as you do.
Yarn Base Composition
50% American bison down / 50% Merino wool
Overall Composition
36% Bison down / 36% Merino wool / 26% Nylon / 2% Spandex
Guide to fiber compositionOur World-Famous Bison Wool Socks
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| Trekker - Advantage Gear Boot Socks | Pro Gear Boot Socks | Yellowstone - Advantage Gear | Pro-Gear Crew Socks | Casual Crew - Advantage Gear Sock | Casual Crew 2.0 - Ultralight Gear Crew Socks | Really Really Nice - Crew Sock *Limited Edition* | American Field (AF) Bison Crew Socks 2022 | O.T.C. - Advantage Gear Compression Sock | Kenai - Ultralight Gear Boot Sock | The B.O.S.S. - Short Sock | Red Dog Kids American Field Jr. - Crew Socks | |
| Height | Boot 14" | Boot 12" | Crew | Crew | Crew | Crew | Crew | Crew | Over-the-calf | Over-the-calf | Ankle | Crew |
| Weight | Extra Heavyweight | Midweight | Heavyweight | Midweight | Lightweight | Lightweight | Lightweight | Midweight | Midweight | Midweight | Midweight | Midweight |
| Performance-Blend | Advantage Gear | Pro Gear | Advantage Gear | Pro Gear | Advantage Gear | Ultralight Gear | Luxury Gear | Advantage Gear | Ultralight Gear | Ultralight Gear | Ultralight Gear | |
| Base-Yarn | 50% American bison down / 50% Merino wool | 50% American bison down / 50% Silk | 50% American bison down / 50% Merino wool | 50% American bison down / 50% Silk | 50% American bison down / 50% Merino wool | 34% American bison down / 33% Merino wool / 33% Bamboo | 50% American bison down / 50% Italian spun ultra fine merino wool | 70% American Bison Down / 30% Polyester | 50% American bison down / 50% Merino wool | 34% Bison Down / 33% Ultrafine Merino Wool / 33% bamboo fiber | 34% American bison down / 33% Merino wool / 33% Bamboo | 33% American bison down / 33% Merino wool / 33% Bamboo |
| Recommended-Footwear-Type | Waders, Muck Boots, Heavy Boots | Insulated Boots, Cowboy Boots | Short boots, Hikers, Trail Shoes | Just about anything | Athletic Shoes, Short Hikers | Athletic Shoes, Short Hikers | Just about anything | Short boots, Hikers, Trail Shoes | Just about anything | Insulated Boots, Cowboy Boots | Athletic Shoes | Just about anything |
| Typical-Use | Extreme cold climate | Skiing, Hiking, Hunting. | Hiking, Hunting, Just a good warm sock | Daily Wear (all climates) | Daily Wear | Daily Wear (warmer climates) | Just about anything | Daily Wear (all climates) | Non-medical grade compression | Fishing/Hunting/Hiking | running, golf, shooting sports, daily wear | Anything, Everything |
| Origin | Made in the USA | Made in the USA | Made in the USA | Made in the USA | Made in the USA | Made in the USA | Made in the USA | Made in the USA | Made in the USA | Made in the USA | Made in the USA | Made in the USA |
| Cushioning | Full cushion | Under foot cushion | Under foot cushion | Under foot cushion | Flat knit (no cushion) | Flat knit (no cushion) | Under foot cushion | Under foot cushion | Under foot cushion | Under foot cushion | Under foot cushion | Full cushion |
| Customer Reviews |
Customer Reviews
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S&D Spinning Mill, Millbury, MA, USA
Designed from the Ground Up
The Dearnley Family has been running S & D Spinning since the 1800s. This is one of the last large scale wool mills left in the U.S. and they are absolutely crucial to us keeping our production here in the U.S.
