The Complete Wool Sweater and Cashmere Care Guide

Wool and cashmere are protein fibers, closer in structure to human hair than to cotton or synthetics. Each strand is covered in microscopic scales that can interlock permanently under heat, agitation, and moisture, which is why shrinkage happens so easily and so fast.

Cashmere is prized because its fibers are finer and shorter than sheep's wool, which gives it that signature softness but also makes it more delicate and prone to pilling. Understanding this difference is the foundation of good care: cashmere needs a gentler hand than a sturdy wool fisherman's sweater, even though both benefit from the same core principles.

Before washing anything, check the label. A hand-wash symbol means the garment can tolerate careful washing at home, while a crossed-out tub icon signals dry clean only, usually because of loose knits, embellishments, or blended fibers that react unpredictably to water.

Temperature dots and bar symbols matter too. One dot or bar typically indicates cold water only, which is almost always the safest choice for wool and cashmere regardless of what the label technically allows. When in doubt, treat any wool or cashmere piece as if it prefers cold water and minimal handling.

So, can you wash cashmere sweaters in a washing machine? In most cases, no, not in a standard cycle. The spinning and agitation that machines rely on is precisely what causes felting and shrinkage. Hand washing wool at home is almost always the safer route, and it is simpler than it sounds.

Fill a basin with cool water and a wool-specific detergent, which is formulated without the harsh enzymes found in regular laundry soap. Submerge the sweater, press the water through gently without rubbing or wringing, and let it soak for a few minutes. Rinse with equally cool water until the soap is gone, then press out excess water with a towel rather than twisting the garment.

If your machine has a dedicated wool cycle with cold water and minimal spin, and the care label permits it, you may be able to use it with a mesh garment bag. This is the exception rather than the rule, and we recommend reserving it only for sturdy, tightly knit wool pieces.

The best way to dry a wool sweater is to lay it flat, never to hang it. Hanging allows gravity to stretch the shoulders and body out of shape while the fibers are wet and most vulnerable. Instead, roll the sweater in a clean towel to absorb excess moisture, then reshape it on a fresh dry towel on a flat surface.

Gently coax the sweater back into its original dimensions, smoothing the sleeves and hem, and leave it away from direct sunlight or heat sources such as radiators. Flip it once the underside feels dry. Patience here protects weeks of careful washing from being undone in a single afternoon.

Pilling is a natural result of friction, particularly under the arms and along areas that rub against bags or coats. The most effective way to remove pilling from cashmere is a dedicated cashmere comb or a fine sweater stone, used in short, gentle strokes in one direction over a flat surface. Electric fabric shavers work well too, provided they are used on a low setting to avoid thinning the knit.

For stains, blot rather than rub, and address them as soon as possible using a small amount of wool detergent diluted in cold water. Odors often lift simply through airing; hang the sweater outdoors or near an open window for an hour rather than reaching for the wash basin every time.

Storing sweaters for winter correctly is as important as washing them correctly. Always fold wool and cashmere rather than hanging them on hooks or hangers, which stretch the shoulders and neckline over time. Use breathable cotton garment bags rather than plastic, which traps moisture and encourages mildew.

Moths are drawn to the natural oils and food residue left on fibers, so ensure every piece is clean before it goes into storage. Cedar blocks or lavender sachets placed among folded sweaters are a time-tested, chemical-free deterrent. Store in a cool, dry place away from direct light to preserve both color and fiber integrity.

As for dry cleaning versus hand washing cashmere, most sweaters do fine with careful home washing every few wears. We recommend professional dry cleaning two to three times per season, or whenever a garment has visible stains, has been worn consistently for formal occasions, or simply needs a refresh before long-term storage.