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Fabric care

How to Care for Wool and Merino: The Full System

Wool punishes the wrong instincts — hot water, hanging, over-washing — and rewards a small set of habits. Learn the rescues first, then the routine that means you rarely need them.

Begin here

How-to

Care for wool by washing less, drying flat and storing clean

Wool stays good by being washed rarely, dried flat, de-pilled early and stored where moths cannot reach it. This page gives the full routine in order, plus how to undo shrinking and pills when they happen.

Wash less, air more: the eighty-twenty of wool care

The single biggest mistake with merino is treating it like cotton. Wool cleans itself: lanolin resists bacteria, the fiber buffers moisture, and a night on a chair resets most knits. Wash on wear-count and the smell test, not the calendar — every wash is a small dose of shape and softness you do not get back.

For a lot of people this means washing a favorite sweater two or three times a season, not weekly. The exception is visible soiling or a full day of sweat — that earns a proper hand-wash.

How do you fix shrunken wool?

The conditioner soak in the troubleshooting section above is the method: cool water, a splash of hair conditioner, patient re-shaping, flat drying. What you must not do is anything hot or aggressive — no tumble dryer, no radiator, no wringing. Heat plus movement is what fuses the fibers into felt, and felt is a one-way door.

How do you stop wool pilling?

You manage it rather than stop it — wool pills where it rubs. Comb pills off early with a cashmere comb, fabric shaver or sweater stone, keeping the fabric taut and working in one direction; matted pills are the ones that pull threads. Prevention does the rest: rest days between wears, awareness of bag straps and desk edges, a tighter weave pills less at purchase if you are choosing between knits — the merino wool guide compares the options.

Moths: prevention, detection and rescue

The adult moth is the harmless-looking messenger; it is the larvae that eat keratin, and the damage shows as grazing holes or fine webbing in folds and underarms. Prevention is a stack: clean every knit before off-season storage, because moths seek soil and sweat; use cedar or lavender as a deterrent, not a killer; and seal the clean items in breathable garment bags.

If you find holes, treat the whole wardrobe, not just the victim: freeze or heat-treat the affected garments per the care label's tolerances, clean the drawer or wardrobe, and decide repair versus discard — one grazing hole in a good knit is usually worth a reweaving service; a colony is not. The clothing care hub covers the rest of the off-season routine.

The wool care kit, and what you do not need

  • Wool detergent — a supermarket own-brand works as well as specialist bottles for most washing.
  • Cashmere comb or fabric shaver — one is enough; the comb is gentler, the shaver faster.
  • Mesh wash bags — cheap insurance for the machine-washable pieces.
  • A flat drying rack — the single most-used item in the kit.
  • Cedar blocks or lavender sachets — a deterrent for drawers, refreshed now and then.

The whole kit costs less than one good sweater. What you can skip: specialist wool sprays and gimmick combs — detergent, a comb, a rack and airflow do the work.

Wool care questions

How often should you wash wool? On the smell test and wear-count rather than a schedule — many knits need only a few washes per season, with airing and spot-cleaning in between. That same odor resistance is why merino tops the no-iron travel shirts list.

Can merino go in the washing machine? If the label says yes: wool cycle, cold, mesh bag, no heated spin. If it says hand-wash only, believe it.

Does cedar stop moths? It deters rather than kills — useful in a drawer, useless as the only defense. Clean-before-storage does the real work.

How do you store wool sweaters? Clean, folded, and in breathable storage with a deterrent — never hung and never sealed away dirty. Cashmere follows the same rules.

What you will finish with.

Wool and merino knits that keep their shape, shed pills before they mat, never meet a moth larva, and come out of storage ready to wear — using a routine built on airing, not constant washing.

Have these ready.

  • Check the care label first — a wool-synthetic blend tolerates more than a pure merino or cashmere, and anything labeled hand-wash only means it.
  • Confirm the fiber: the methods here suit animal fibers (wool, merino, lambswool, cashmere); cotton knits follow different rules.
  • Have wool detergent and a cashmere comb or fabric shaver on hand before you start, not after the accident.

One step at a time.

  1. Air it instead of washing it

    After wearing, lay the knit on a chair or hang it briefly in an airy spot overnight. Wool's lanolin and moisture buffering let it shed odors on its own, and most smells are gone by morning.

    Check: Smell the underarm area up close in the morning — if nothing registers, it goes back in rotation unwashed.

  2. Spot-clean small marks

    Dab the mark with cool water and a drop of wool detergent, working from the outside of the stain inward. A full wash for one spill is how knits wear out early.

    Check: Once dry, the spot shows no ring and the surrounding fabric looks identical.

  3. Hand-wash when it is genuinely due

    Tepid water — never hot — with wool detergent, a five-to-ten-minute soak, no agitation and no wringing. Roll the knit in a clean towel to press water out, then dry it flat on a rack away from radiators.

    Check: The sweater comes out the same dimensions it went in, with no stiffness — stiffness means heat or agitation felted it.

  4. Machine-wash only on the wool cycle, only when safe

    If the label permits it: wool cycle, cold, mesh wash bag, and no heated spin. When the label says hand-wash only, or the knit is loosely woven or an heirloom, never risk the machine.

    Check: After drying flat, the cuffs and hem still hug and the shoulders have not stretched.

  5. De-pill before it mats

    Lay the sweater flat, pull the fabric taut, and work a cashmere comb or fabric shaver in short strokes in one direction. Focus on high-friction zones: where bag straps, seatbelts and chair backs sit, and under the arms.

    Check: The surface reads even in raking light, with no fuzz left and no holes opened.

  6. Store folded and clean

    Fold knits over a hanger-width bar or stack them flat — hanging stretches shoulders into bumps. Before off-season storage, wash or air them, because moths seek out soil and sweat, not clean wool.

    Check: At the start of the next season, no shoulder bumps, no holes, no stored-in smell.

  7. Set the rotation

    Give each knit at least a day of rest between wears so fibers recover and moisture dries out. Rotation, more than any product, is what keeps pills from forming in the first place.

    Check: No single sweater in your drawer is being worn more than every other day in a given week.

Check your result.

If it is not working yet.

The sweater shrank

Soak it in cool water with a little hair conditioner for about half an hour to relax the fibers, then gently ease it back toward shape and dry it flat, re-blocking to its old dimensions by eye. Recovery odds are honest but partial: felted wool (stiff, dense, matted) is permanent, while merely shrunk wool often recovers most of its size.

It is pilling fast

Comb it now, before the pills tangle into mats — direction, tension and a taut surface matter more than the tool. Then fix the cause: add rest days between wears, and watch the friction points where straps and desk edges rub.

Cuffs or hem have stretched

Steam the area briefly, work the ribbing back even with your fingers, and press it flat to cool. If the ribbing is completely gone — stretched thin and shiny — the elastic memory is dead and the fix is permanent tailoring or accepting it.

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