Our newest midweight sock, just 100% natural fibers. 50% American Bison Down and 50% Montana Merino wool.
Sometimes a product idea just completely makes sense. In the world of sock manufacturing, where synthetic fibers like nylon and spandex reign supreme for their stretch and durability, creating a truly 100% natural sock seemed like an impossible dream.
We approached dozens of mills across the country, each one shaking their heads: "Without synthetics, the socks won't hold up," they'd say, or "It's just not feasible in modern production." Refusal after refusal left us wondering if our vision for pure bison and merino wool socks—free from plastics, chemicals, and any artificial additives—would ever come to life.That's when Mike Caird, at the Knitting Mill in Liberty Hill stepped up like a beacon of old-school craftsmanship. Nestled in the heart of Texas, this family-run operation embraced the challenge with open arms. Drawing on generations of expertise in natural fibers, they retooled their looms and perfected a knitting technique that relied solely on the inherent strength and elasticity of bison down and merino wool. No compromises, no shortcuts—just pure, earth-friendly innovation.
A "true 2x2 rib" knit crew sock of the old-school variety, this sock has the great foot fit and stay of our technical socks. It is insulating, soft and cozy, and wicks moisture away like nothing you’ve ever experienced.
Thanks to their dedication, our socks are now a reality: warm, breathable, and resilient, proving that nature knows best. The Knitting Mill didn't just make socks; they revived a tradition of sustainable textile artistry, one stitch at a time.
These socks are incredibly easy to care for and due to their antimicrobial properties, feel free to wear them a few times before washing. But when they do need to be cleaned, simply machine wash warm, then toss them in the dryer.
Socks should fit as comfortably as any other garment. The heel should rest on your heel—not under it (as with a sock that’s too small) or halfway up your Achilles (as with a sock that’s too large). The sock should be snug against your foot with no sagging fabric. The toe seam should lie flat across the top of your toes.
Sock Heel at Your Heel
The heel of the sock should sit directly on your heel, not above or below it.
Flat Toe Seam
The toe seam should lay flat along the top of your toes, not above or below them.
Taut Across the Foot
Socks should fit snugly across your foot without any sagging material. If you wear wide shoes (E+), consider
sizing up.
If you wear a wide shoe size (E+), consider sizing up.
| Sock Size | Shoe Size | |
|---|---|---|
| US Men | US Women | |
| Small | – | 3 – 6 |
| Medium | 5 – 9 | 6 – 10 |
| Large | 9 – 12 | 10 – 13 |
| X-Large | 12 – 15 | – |
These socks are incredibly easy to care for and due to their antimicrobial properties, feel free to wear them a few times before washing. But when they do need to be cleaned, simply machine wash warm, then toss them in the dryer.
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 gearHere 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.
50% Bison Down / 50% Merino Wool
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| Trekker - Advantage Gear Boot Socks- New Run | Pro Gear Boot Socks | Kenai - Ultralight Gear Boot Sock | Pure Prairie - 100% Natural Crew Socks | Pro Gear Crew Socks | Yellowstone - Advantage Gear Crew Sock | Casual Crew 2.0 - Ultralight Gear Crew Socks | Red Dog Kids American Field Jr. - Crew Socks | The B.O.S.S. - Ultralight Gear Short Sock | No-Show - Ultralight Yak Ankle Socks | O.T.C. - Advantage Gear Compression Sock | |
| Height | Boot 14" | Boot 12" | Over-the-calf | Crew | Crew | Crew | Crew | Crew | Ankle | Ankle | Over-the-calf |
| Weight | Extra Heavyweight | Midweight | Midweight | Midweight | Midweight | Heavyweight | Lightweight | Midweight | Midweight | Lightweight | Midweight |
| Performance Blend | Advantage Gear | Pro Gear | Ultralight Gear | Advantage Gear | Pro Gear | Advantage Gear | Ultralight Gear | Ultralight Gear | Ultralight Gear | Advantage Gear | |
| Cushioning | Full cushion | Under foot cushion | Under foot cushion | Flat knit (no cushion) | Under foot cushion | Under foot cushion | Flat knit (no cushion) | Full cushion | Under foot cushion | Flat knit (no cushion) | Under foot cushion |
| Recommended Footwear Type | Waders, Muck Boots, Heavy Boots | Insulated Boots, Cowboy Boots | Insulated Boots, Cowboy Boots | Athletic Shoes, Short Hikers | Just about anything | Short boots, Hikers, Trail Shoes | Athletic Shoes, Short Hikers | Just about anything | Athletic Shoes | Just about anything | Just about anything |
| Typical Use | Extreme cold climate | hiking, hunting, fishing, skiing, snowmobiling, sledding, ice skating, dog-walking | Fishing/Hunting/Hiking | Daily Wear (warmer climates) | Daily Wear (all climates) | Hiking, Hunting, Just a good warm sock | Daily Wear (warmer climates) | Anything, Everything | running & tennis shoes, casual loafers, golf, shooting sports, short hikers, daily wear | Non-medical grade compression | |
| Base Yarn | 50% American bison down / 50% Merino wool | 50% American bison down / 50% Silk | 34% Bison Down / 33% Ultrafine Merino Wool / 33% bamboo fiber | 50% 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 | 33% American bison down / 33% Merino wool / 33% Bamboo | 34% American bison down / 33% Merino wool / 33% Bamboo | 70% Yak Down / 30% Nylon | 50% American bison down / 50% Merino wool |
| Overall Composition | 38% merino wool / 30% American bison down / 30% nylon / 2% Lycra spandex | 32% American bison down / 32% silk / 26% nylon / 4% polyester / 4% Tencel / 2% Lycra spandex | FOOT: 29% American bison down / 28% nylon / 25% bamboo / 16% merino wool / 2% Spandex | LEG: 72% polypropylene / 26% nylon / 2% Spandex | 50% Bison Down / 50% Merino Wool | 30% American bison down / 30% silk / 30% nylon / 4% Tencel / 4% polyester / 2% Lycra spandex | 36% Merino wool / 28% Bison down / 26% Nylon / 8% Polyester / 2% Spandex | 26% American bison down / 25% merino wool / 25% bamboo / 20% nylon / 3% Lycra spandex / 2% polyester | 24% American Bison Down / 24% Merino Wool / 23% Bamboo Fiber / 23% Nylon 4% Poly / 2% Spandex | 24% American bison down / 24% merino wool / 24% bamboo / 23% nylon / 3% polyester / 2% Lycra spandex | 53% Nylon / 41% Yak Down / 4% Polyester / 2% Spandex | 45% merino wool / 31% nylon / 18% American bison down / 4% polyester / 2% Lycra spandex |
| 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 |
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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.
