Wool: Deep Dive

🧵 Wool: What Are You Really Wearing?

🎙️ TL;DR – Quick Listen Summary

The Scenario: Everyone wears wool thinking it breathes, stays warm wet, and fights odor. But that's only true if it's still wool.

What We Found: Most modern wool is chemically altered to behave like synthetics: coated, stripped, plasticked, or blended.

In the Field: If your "Merino" shirt takes hours to dry, holds funk, or feels more like a wetsuit—you're not imagining it.

What You Can Do: Understand the treatments. Read labels. Decide what behavior you want, then reverse-engineer the wool.

⏩ Jump ahead to: Treatments Table / ELI Practitioner Notes / References

🎯 Let’s Define the Problem

Everyone’s heard the pitch: wool breathes, wicks, stays warm when wet, and resists odor. But if you’ve worn it, washed it, and tested it—you may have found that’s not always the case.

This post is about why that happens: wool is not always wool anymore.

🏞️ Where I’m Coming From (Preface)

I’ve hunted in humid hardwoods and frozen timberline. I’ve worn every kind of base layer—from raw Shetland to synthetic mesh to high-end Merino fleece. And I’ve sweated through, frozen in, and field-tested them all.

This isn’t just data—it’s personal experience paired with hard research.

🧭 What This Series is Trying to Do

This blog exists to:

• Show how natural fibers really perform under pressure

• Compare lab-tested drying and moisture retention to field outcomes

• Expose how chemical treatments transform fibers

• Give you the vocabulary to ask better questions—and gear up smarter

No brand loyalty. No agenda. Just data, experience, and analysis.

📚 Your Map – Layering Series Index

Part	Title	Summary
1	Our Bodies	Thermoregulation, odor, nutrition
1.1	The Climates We Recreate In	Humidity, altitude, temperature, wet/dry states
2	Material Data	Drying speed, vapor buffering, thermal lag
2A	Wool	Adsorption, structure, thermodynamics
2B	Membranes	Waterproof-breathable failure under pressure
2.1	Caring for Your Gear	Maintenance that preserves performance
3	Application Theory	Matching fabric to pace, terrain, exposure

🔬 What Happens to Wool During Processing

Let’s get brutally clear:

The wool in your $110 Merino tee has been scoured, stripped, acid-treated, bleached, coated, dried, spun, resin-sealed, and often blended with plastic.

Wool off the sheep contains lanolin, a friction-rich cuticle, high crimp, and excellent vapor buffering. But in order to make it machine-washable, soft, and smooth, the industry removes what made it work.

That’s not an opinion—it’s a systems-level outcome. The cuticle is destroyed. The scales are sealed. The lanolin is gone. The friction (which held water in a usable vapor phase) is reduced. The result? A smooth, plastic-coated protein fiber.

🧪 Wool Treatments Table

| Treatment | Method Summary | Performance Shift | Synthetic Behavior? |

|------------------------|------------------------------------------|----------------------------------------------------|---------------------|

| Scouring | Detergent wash removes lanolin/sweat | Removes odor resistance, friction | Low |

| Carbonizing | Acid bath removes vegetable matter | Slight weakening if overapplied | Low |

| Chlorination | Oxidizes/burns cuticle surface | Destroys structure, increases slickness | High |

| Resin Coating | Polyamide shell (Hercosett) | Seals in water, blocks vapor exchange | High |

| Superwash | Chlorine + resin combo | Fully synthetic-like behavior | Very High |

| Plasma Treatment | Ionizes fiber surface | Removes oils, opens bond sites | Medium |

| Enzyme Padding | Protease weakens scale edges | Retains most behavior, gentler than others | Low |

| Biopolymer Coating | Chitosan/sericin film | Surface stiffening, mildly hydrophilic | Low–Medium |

| Silicone / DWR | Hydrophobic surface film | Blocks wetting, slows vapor movement | Medium |

| Nano-coating | UV/odor nanoscale finish | Minimal impact, usually temporary | Low |

| Raising / Sueding | Brushed surface for softness | Warmer but slower drying | Low–Medium |

| Fulling / Boiling | Felting by heat/agitation | Denser, windproof; outerwear use only | Medium–High |

| Crabbing | Heat-tension dimensional setting | No moisture impact, improves shape memory | None |

| Hybrid Yarn Construction| Wool spun around synthetic core | Strength up, wool traits down | High |

🐑 Wool Breed & Fiber Type Table

| Breed | Micron Range | Staple Length | Crimp | Lanolin Retention | Behavior Summary |

|---------------------|--------------|----------------|-----------|-------------------|--------------------------------------------------|

| Merino | 17–21.5 µm | 60–100 mm | High, fine| High | Soft, breathable, ideal untreated; very versatile|

| Polwarth | 21–24 µm | 100–130 mm | High, bulky| Very High | Resilient loft; bonds well with lanolin |

| Rambouillet | 18–21.5 µm | 75–100 mm | High | High | Tougher than Merino, good structure retention |

| Corriedale | 23–27 µm | 80–120 mm | Medium | Moderate | Midlayer-grade, solid wet handling |

| Romney | 29–36 µm | 125–175 mm | Low | Low | Best brushed/fulled; not next-to-skin |

| Shetland | 25–30 µm | 80–100 mm | Low–med | Moderate | Excellent for felting, rustic feel |

| Lincoln | 33–40 µm | 200–300 mm | Low | Very Low | Rug wool; strong but coarse |

| BFL (Leicester) | 24–28 µm | 75–125 mm | Low–med | Limited | Luxury knits; not highly functional untreated |

| Icelandic (Outercoat)| 30–38 µm | 150–200 mm | Very low | Surface only | Weather-resistant shell; not base layer |

🧠 ELIPractitioner Highlights

• Superwash kills performance. Once wool is chlorinated and resin-coated, it won’t breathe, adsorb vapor, or resist odor the same way.

• Enzyme treatment is a better option. It preserves much of the wool’s structure while improving durability.

• Plasma and biopolymer treatments are middle ground. Better for the environment, moderate on fiber.

• Hybrid yarns behave like what’s inside—not what’s outside. If it's wrapped around nylon, it'll act like nylon.

📊 Field Implications

• If your wool shirt doesn’t feel like it used to—it’s probably not you. It’s the finish.

• The more a shirt claims to be “easy care” and “no itch”, the more likely it’s had its wool-ness removed.

• Boiled wool outerwear? Legit. Midweight “Merino” base layers that never dry? Check the label. It might be more resin than wool.

📚 Reference Library

• Wang et al., 2018 – Enzyme padding shrinkproofing

• Udakhe et al., 2022 – Modern treatment comparisons (chlorine, resin, enzyme, plasma)

• Thomas et al., 2006 – Plasma surface activation

• Mazow, 2017 – Felting and lanolin loss

• Siroky et al., 2009 – Oxidative alternatives to chlorine

(Full references and bibliography available upon request)

✅ Key Conclusions

• Read past the “Merino wool” label.

• Ask what treatments were used.

• Know that structure equals behavior—once you coat or destroy the structure, the performance is gone.

• If you want wool to act like wool, you’ll have to care for it like wool.

Want to see brand-level comparisons, drying test data, or treatment-specific gear reviews? Drop a note.

Use your gear in anger. That’s how it teaches you.

🧵 Wool: What Are You Really Wearing?

🎙️ TL;DR – Quick Listen Summary

The Scenario: Everyone wears wool thinking it breathes, stays warm wet, and fights odor. But that's only true if it's still wool.

What We Found: Most modern wool is chemically altered to behave like synthetics: coated, stripped, plasticked, or blended.

In the Field: If your "Merino" shirt takes hours to dry, holds funk, or feels more like a wetsuit—you're not imagining it.

What You Can Do: Understand the treatments. Read labels. Decide what behavior you want, then reverse-engineer the wool.

⏩ Jump ahead to: Treatments Table / ELI Practitioner Notes / References

🎯 Let’s Define the Problem

Everyone’s heard the pitch: wool breathes, wicks, stays warm when wet, and resists odor. But if you’ve worn it, washed it, and tested it—you may have found that’s not always the case.

This post is about why that happens: wool is not always wool anymore.

🏞️ Where I’m Coming From (Preface)

I’ve hunted in humid hardwoods and frozen timberline. I’ve worn every kind of base layer—from raw Shetland to synthetic mesh to high-end Merino fleece. And I’ve sweated through, frozen in, and field-tested them all.

This isn’t just data—it’s personal experience paired with hard research.

🧭 What This Series is Trying to Do

This blog exists to:

• Show how natural fibers really perform under pressure

• Compare lab-tested drying and moisture retention to field outcomes

• Expose how chemical treatments transform fibers

• Give you the vocabulary to ask better questions—and gear up smarter

No brand loyalty. No agenda. Just data, experience, and analysis.

📚 Your Map – Layering Series Index

Part	Title	Summary
1	Our Bodies	Thermoregulation, odor, nutrition
1.1	The Climates We Recreate In	Humidity, altitude, temperature, wet/dry states
2	Material Data	Drying speed, vapor buffering, thermal lag
2A	Wool	Adsorption, structure, thermodynamics
2B	Membranes	Waterproof-breathable failure under pressure
2.1	Caring for Your Gear	Maintenance that preserves performance
3	Application Theory	Matching fabric to pace, terrain, exposure

🔬 What Happens to Wool During Processing

Let’s get brutally clear:

The wool in your $110 Merino tee has been scoured, stripped, acid-treated, bleached, coated, dried, spun, resin-sealed, and often blended with plastic.

Wool off the sheep contains lanolin, a friction-rich cuticle, high crimp, and excellent vapor buffering. But in order to make it machine-washable, soft, and smooth, the industry removes what made it work.

That’s not an opinion—it’s a systems-level outcome. The cuticle is destroyed. The scales are sealed. The lanolin is gone. The friction (which held water in a usable vapor phase) is reduced. The result? A smooth, plastic-coated protein fiber.

🧪 Wool Treatments Table

| Treatment | Method Summary | Performance Shift | Synthetic Behavior? |

|------------------------|------------------------------------------|----------------------------------------------------|---------------------|

| Scouring | Detergent wash removes lanolin/sweat | Removes odor resistance, friction | Low |

| Carbonizing | Acid bath removes vegetable matter | Slight weakening if overapplied | Low |

| Chlorination | Oxidizes/burns cuticle surface | Destroys structure, increases slickness | High |

| Resin Coating | Polyamide shell (Hercosett) | Seals in water, blocks vapor exchange | High |

| Superwash | Chlorine + resin combo | Fully synthetic-like behavior | Very High |

| Plasma Treatment | Ionizes fiber surface | Removes oils, opens bond sites | Medium |

| Enzyme Padding | Protease weakens scale edges | Retains most behavior, gentler than others | Low |

| Biopolymer Coating | Chitosan/sericin film | Surface stiffening, mildly hydrophilic | Low–Medium |

| Silicone / DWR | Hydrophobic surface film | Blocks wetting, slows vapor movement | Medium |

| Nano-coating | UV/odor nanoscale finish | Minimal impact, usually temporary | Low |

| Raising / Sueding | Brushed surface for softness | Warmer but slower drying | Low–Medium |

| Fulling / Boiling | Felting by heat/agitation | Denser, windproof; outerwear use only | Medium–High |

| Crabbing | Heat-tension dimensional setting | No moisture impact, improves shape memory | None |

| Hybrid Yarn Construction| Wool spun around synthetic core | Strength up, wool traits down | High |

🐑 Wool Breed & Fiber Type Table

| Breed | Micron Range | Staple Length | Crimp | Lanolin Retention | Behavior Summary |

|---------------------|--------------|----------------|-----------|-------------------|--------------------------------------------------|

| Merino | 17–21.5 µm | 60–100 mm | High, fine| High | Soft, breathable, ideal untreated; very versatile|

| Polwarth | 21–24 µm | 100–130 mm | High, bulky| Very High | Resilient loft; bonds well with lanolin |

| Rambouillet | 18–21.5 µm | 75–100 mm | High | High | Tougher than Merino, good structure retention |

| Corriedale | 23–27 µm | 80–120 mm | Medium | Moderate | Midlayer-grade, solid wet handling |

| Romney | 29–36 µm | 125–175 mm | Low | Low | Best brushed/fulled; not next-to-skin |

| Shetland | 25–30 µm | 80–100 mm | Low–med | Moderate | Excellent for felting, rustic feel |

| Lincoln | 33–40 µm | 200–300 mm | Low | Very Low | Rug wool; strong but coarse |

| BFL (Leicester) | 24–28 µm | 75–125 mm | Low–med | Limited | Luxury knits; not highly functional untreated |

| Icelandic (Outercoat)| 30–38 µm | 150–200 mm | Very low | Surface only | Weather-resistant shell; not base layer |

🧠 ELIPractitioner Highlights

• Superwash kills performance. Once wool is chlorinated and resin-coated, it won’t breathe, adsorb vapor, or resist odor the same way.

• Enzyme treatment is a better option. It preserves much of the wool’s structure while improving durability.

• Plasma and biopolymer treatments are middle ground. Better for the environment, moderate on fiber.

• Hybrid yarns behave like what’s inside—not what’s outside. If it's wrapped around nylon, it'll act like nylon.

📊 Field Implications

• If your wool shirt doesn’t feel like it used to—it’s probably not you. It’s the finish.

• The more a shirt claims to be “easy care” and “no itch”, the more likely it’s had its wool-ness removed.

• Boiled wool outerwear? Legit. Midweight “Merino” base layers that never dry? Check the label. It might be more resin than wool.

📚 Reference Library

• Wang et al., 2018 – Enzyme padding shrinkproofing

• Udakhe et al., 2022 – Modern treatment comparisons (chlorine, resin, enzyme, plasma)

• Thomas et al., 2006 – Plasma surface activation

• Mazow, 2017 – Felting and lanolin loss

• Siroky et al., 2009 – Oxidative alternatives to chlorine

(Full references and bibliography available upon request)

✅ Key Conclusions

• Read past the “Merino wool” label.

• Ask what treatments were used.

• Know that structure equals behavior—once you coat or destroy the structure, the performance is gone.

• If you want wool to act like wool, you’ll have to care for it like wool.

Want to see brand-level comparisons, drying test data, or treatment-specific gear reviews? Drop a note.

Use your gear in anger. That’s how it teaches you.