Wool Fabric 101
Wool is fabric spun from sheep's fleece — a natural protein fiber whose built-in crimp traps millions of tiny air pockets, which is why nothing insulates for its weight quite like it. Wool keeps warming even when damp, absorbs a third of its weight in moisture before feeling wet, resists odor for days, and springs back from wrinkles overnight.
The fiber's one famous weakness — shrinking into felt — is not really shrinkage at all, and understanding it makes wool easy to live with.
Merino and the itch question
Wool's feel depends on fiber diameter, measured in microns. Coarse wool (the itchy childhood sweater) runs thick; merino runs fine enough to flex against skin instead of prickling it, which is why merino jersey works as a base layer. If wool has ever felt scratchy to you, the fix is finer wool, not no wool.
The main wool cloths
- Suiting — smooth, fine twills and plainweaves for tailoring
- Coating — dense, heavy, often brushed; winter coats
- Boiled wool / melton — washed until slightly felted; structured, wind-resistant, no fraying
- Wool jersey and sweater knits — stretch and drape with wool's warmth
- Flannel and tweed — brushed softness and rustic texture respectively
What to sew with wool
- Coats, blazers and structured jackets
- Trousers and skirts in suiting weights
- Dresses in wool crepe or jersey
- Beanies, scarves and mittens from knits
Wool is the tailor's favorite fiber for a reason: it eases, shapes and presses like nothing else. Steam a wool sleeve cap and the fullness simply disappears.
Why wool felts — and how to prevent it
Each wool fiber is covered in microscopic scales. Heat, moisture and agitation together make the scales ratchet against each other and lock — that is felting, and it is permanent. Remove any one of the three and wool is safe: hence cold water, gentle handling, flat drying. Superwash wool has had its scales smoothed or coated and can take a machine cycle.
How to care for wool
Most wool wants a cold hand wash with wool detergent, a gentle squeeze in a towel, and a flat dry — or the dry cleaner. The good news: wool rarely needs washing at all. Airing a garment overnight resets odor, and brushing lifts surface soil. Store clean and folded, with cedar or lavender against moths.
Environmentally, wool is renewable and fully biodegradable, and its rarely-needs-washing habit saves real water and energy over a garment's life; the honest other side of the ledger is sheep farming's land and methane footprint. Wool's strongest green argument is longevity — a wool coat measured in decades beats almost any fiber measured in seasons.
Wool, measured
What wool becomes on our shelf
- Rib38%
- Jersey20%
- Boucle10%
- Wool Coating7%
- Interlock6%
Share of listings by cloth type — one fabric can carry more than one.
Live from 101 measured listings on our shelf. How we measure →
Common questions
Is merino wool itchy?
No — merino fibers are fine enough to bend against skin rather than prickle. Itch is a fiber-diameter problem, and merino solves it.
Does wool shrink in the wash?
It felts: heat plus agitation locks the fiber scales together permanently. Cold water and gentle handling prevent it entirely, and superwash-treated wool is machine-safe.
Is wool warm when wet?
Warmer than anything else you could be wearing. The crimped fiber keeps trapping air even while absorbing moisture, and wool releases a little heat as it absorbs water — old sailors' knowledge, real chemistry.
What is boiled wool?
Wool knit or cloth deliberately washed hot until it tightens and slightly felts. The result is dense, structured, wind-resistant and non-fraying — a favorite for unlined jackets.
