How to Care for Wool and Cashmere Knits

Wool and cashmere feel like a splurge even when they aren't, and they reward good treatment with years of warmth. They also punish carelessness faster than almost any other fabric — one hot wash and a lovely sweater comes out sized for a child, felted and stiff and beyond saving. That single risk scares people into either dry-cleaning everything or avoiding nice knits altogether.

Neither is necessary. Natural fibers like these are actually low-maintenance once you understand how they behave. They resist odor, they don't need frequent washing, and they last for years when handled gently. The rules are few and mostly about restraint — being cool, slow, and hands-off rather than hot and rough. Learn them once and your knits will outlast most of the rest of your wardrobe.

Wash far less than you think#

The first thing to know about wool and cashmere is that they barely need washing. These fibers naturally resist odor and shed wrinkles, so a sweater you've worn a few times usually just needs airing, not a wash. Every wash carries some risk of shrinkage and wear, so the less you do it, the longer the knit lasts.

Hang a worn sweater somewhere with moving air for a day and it often freshens completely on its own. Spot-clean small marks rather than washing the whole thing. Reserve a full wash for when a garment is genuinely soiled or has picked up a smell that airing won't shift — for many sweaters that's a couple of times a season at most, not after every wear.

Give a wool or cashmere sweater a rest day between wears. Letting the fibers relax and recover keeps their shape and springiness far better than wearing the same knit two days running.

That habit alone — airing and resting instead of washing — does more for a knit's life than any product.

Wash cool, gentle, and by hand#

When a wash is genuinely needed, temperature and agitation are everything. Heat and rough movement are what cause wool to felt and shrink, so the whole game is keeping both low. Hand-washing gives you the most control, and it's easier than it sounds.

• Fill a basin with cool or lukewarm water — never hot
• Add a small amount of gentle detergent made for wool or delicates, not regular laundry soap
• Turn the garment inside out and submerge it, pressing gently rather than scrubbing or twisting
• Let it soak for a few minutes, then drain and rinse in cool water of the same temperature
• Avoid sudden temperature changes, which shock the fibers

If you'd rather use the machine, only do so if it has a genuine wool or hand-wash cycle, place the knit in a mesh bag, and use cool water and the slowest spin. When in doubt, the sink is safer. And always trust the care label — if it says dry clean only, that instruction is there for a reason, especially on structured or blended pieces.

Dry flat, never hung#

Drying is where most knit disasters happen, and the rule is simple: never wring, never hang. A wet sweater is heavy, and wool fibers are stretchy when saturated, so hanging one lets gravity pull it into a long, misshapen version of itself that never fully recovers. Wringing twists and felts the fibers.

Instead, press the water out gently. Lay the wet knit flat on a clean towel, roll the towel up with the sweater inside like a jelly roll, and press to squeeze out moisture. Then unroll, lay the sweater flat on a fresh dry towel or a mesh drying rack, and gently reshape it to its proper dimensions — smoothing the body, patting the sleeves into place. Leave it flat, away from direct heat and sunlight, until fully dry. It takes longer than tumble-drying, but tumble-drying is exactly how knits shrink, so patience here is the whole point.

Deal with pilling calmly#

Those little balls of fiber that form where a sweater rubs against itself — on the sides, under the arms, along a bag strap — are pills, and they alarm people more than they should. Pilling is not a sign of a cheap or faulty knit; it's a normal result of friction on soft fibers, and even fine cashmere pills. It's easily fixed.

The gentlest tool is a wooden or plastic sweater comb, which you draw across the surface to lift and remove pills. A battery-powered fabric shaver is faster for a whole sweater; just keep it moving lightly rather than pressing, so you don't nick the knit. Lay the garment flat on a table, work in one direction, and the surface comes back looking new. You can reduce pilling in the first place by resting knits between wears, turning them inside out to wash, and keeping them away from rough bag straps and coarse outer layers.

It's worth knowing that pilling usually slows down after the first few wears and washes. Loose, short fibers on the surface are the ones that tangle into pills, and once they've worked their way out, what remains is the more stable core of the yarn. So a new sweater that seems to pill alarmingly often settles down once you've groomed it a couple of times. Resist the urge to declare it faulty and return it — a few sessions with a comb and it typically reaches a calm, smooth state that lasts.

Store knits so they last the summer#

Wool and cashmere are the fabrics most at risk in storage, because clothes moths love them, so the off-season needs care. Always store them clean — invisible body oils and food traces are what attract pests — and store them folded, never hung, so they don't stretch over months. Fold them flat in a breathable box or bag rather than sealed plastic, which can trap moisture, and add cedar or lavender as a deterrent in the enclosed space. For the full routine across your whole wardrobe, see how to store off-season clothes, which knits fit right into.

Getting the most from good knits#

Caring for wool and cashmere comes down to gentleness and patience: wash rarely, wash cool, dry flat, de-pill without fear, and store clean and folded. None of it is difficult, and all of it protects pieces that tend to cost more per garment than the rest of what you own. Treated this way, a good sweater becomes one of the longest-lived things in your closet — warm, soft, and still holding its shape years after a careless owner would have shrunk or moth-eaten it.

Think of the small extra effort as part of the pleasure of owning something nice. A cashmere sweater you can pull on for a tenth winter, still lovely, is worth far more than a cheaper one replaced every year — and it got there because you were kind to it.