The Art of Knit — A Technical Study
The Ultimate Guide
to Merino
Everything you never knew you wanted to know about nature's best fibre.
Words by Edzard Van Der Wyck · 27 March 2025
It breathes. It wicks. It warms. It cools.
It stretches. It bounces back. It barely needs washing.
It's not magic. It's Merino.
The fibre that outperforms synthetics — without a single drop of plastic. The one that's been evolving for centuries on the backs of sheep. Let's take a closer look.
Classification
What Is Merino Wool?
Merino wool comes from Merino sheep — a breed originally from Spain, now primarily raised in Australia and New Zealand.
It's renowned for its ultra-fine fibres and high natural performance. While traditional wool sits around 30 microns in diameter, Merino ranges from 17 to 19 microns. That's finer than human hair — and why it feels soft against the skin, not itchy.
Fibre Diameter — Micron Scale (μm)
Structural Analysis
The Structure of a Merino Fibre
Each Merino fibre is made up of a complex, layered structure. Scroll to reveal the anatomy:
Fibre Anatomy — Cross Section
Cuticle
Overlapping scales that repel water and resist stains. This protective layer keeps Merino garments cleaner for longer.
Cortex
A dual-cell structure (ortho & para) that absorbs moisture vapour while remaining dry to the touch. This is what enables Merino's extraordinary wicking.
Medulla
Absent in ultrafine Merino (<19μm). Its absence is what makes the fibre so flexible and soft against skin.
Natural Crimp Pattern — ~30 crimps per cm
Each crimp traps air → air insulates → warmth without weight
Performance Metrics
Key Properties
Temperature Regulating
Keeps you warm in winter, cool in summer. Active buffering across a 3°C comfort range.
Moisture Wicking
Absorbs up to 35% of its weight in moisture without feeling damp. Vapour moves through the cortex.
Odour Resistant
Naturally inhibits bacterial growth — wear it 3× longer between washes compared to synthetics.
Elastic Recovery
Returns to shape, resisting bagging and sagging. The crimp acts as a natural spring.
Fire Resistant
Naturally flame-retardant and self-extinguishing. Limiting Oxygen Index of 25 vs polyester's 20.
Biodegradable
Breaks down in soil within approximately 90 days. Zero microplastic shedding into waterways.
Staple Length Comparison (mm)
Fewer loose ends, less pilling
More pilling, weaker structure
Comparative Analysis
Natural Performance vs Synthetics
Synthetics mimic Merino's properties with chemical treatments — anti-odour sprays, moisture-wicking finishes, temperature-reactive coatings. Merino achieves it all without chemicals.
Renewable
Grows back every year, from grass, sun, and rain.
Biodegradable
Breaks down in soil or water within months.
Zero Microplastics
Doesn't shed plastic into waterways or the ocean.
Provenance
How It's Grown Matters
At Sheep Inc., we only use regeneratively farmed Merino from New Zealand — sourced exclusively from farms certified by the ZQ and ZQRX programmes.
No fertiliser overuse
No soil degradation
Verified animal welfare
Measurable carbon sequestration
Healthy pastures = healthy sheep = stronger, better wool.
Care Protocol
Maintenance Sequence
Air
Hang between wears. Merino self-cleans via moisture absorption and release.
Store
Keep in a protective bag. All our knits arrive in the perfect storage bag.
Spot-clean
Address stains immediately. Merino's cuticle layer makes this highly effective.
Wash rarely
Hand or cold gentle cycle only after multiple wears. Wool detergent only.
Dry flat
Roll in a towel first. Never tumble dry — heat damages fibre structure.
Depill
Use a fabric shaver or the comb included with your first purchase.
Why We Use Merino
It breathes. It adapts. It biodegrades.
It works hard. And it wears beautifully.
Nature spent centuries perfecting this fibre. We're just building on it.
