The Complete Guide to Sweater and Wool Care

From hand washing to moth-proof storage, here is everything you need to know about wool sweater care so your favorite knits last for winters to come.

Wool fibers are covered in tiny scales, similar to the shingles on a roof. When exposed to heat, agitation, or harsh detergent, those scales open up and lock together, which is what causes the dreaded shrink-and-felt effect. This is also why cashmere sweater care demands even more gentleness than regular wool, since cashmere fibers are finer and more delicate.

Understanding this structure is the first step toward proper wool sweater care instructions. Once you know why wool behaves the way it does, every step that follows, from washing to storage, makes a lot more sense.

Before you touch water or detergent, check the label. Symbols like a hand in a basin mean hand wash only, a crossed-out washing machine means never machine wash, and a circle inside a square with an X means do not tumble dry. Some wool blends are machine washable on a wool cycle, but pure wool and cashmere almost always call for hand washing.

If the label has faded or been cut out, treat the garment as delicate by default. It costs you a little extra time, but it protects the investment you made in the sweater.

Can you machine wash a wool sweater? Sometimes, but only if the label explicitly allows it, and even then, we recommend a mesh laundry bag, cold water, and a wool-specific cycle with minimal spin. When in doubt, hand washing wool is the safer route.

To hand wash, fill a basin with lukewarm water and a wool-safe detergent. Submerge the sweater, press gently through the water without twisting or scrubbing, and let it soak for five to ten minutes. Rinse with water of the same temperature to avoid shocking the fibers, since sudden temperature changes are a major cause of shrinkage. This single habit is one of the most effective ways to shrink proof wool over the long term.

Never wring or hang a wet wool sweater, as the weight of the water will stretch it out of shape permanently. Instead, lay it flat on a clean towel, roll the towel up to press out excess water, then reshape the sweater on a fresh dry towel and let it air dry away from direct sunlight or heat vents.

How do you get wrinkles out of a wool sweater? Steam is your best friend here. Hold a garment steamer a few inches away from the fabric, or hang the sweater in a steamy bathroom for a few minutes. Avoid direct ironing, as high heat can flatten fibers and leave a permanent shine.

Pilling is natural and not a sign of poor quality. A wool comb, fabric shaver, or even a fine-toothed razor can gently lift pills without damaging the knit. Work slowly and in one direction for the best results.

For odors, skip the wash and instead hang the sweater outside in fresh air, or place it in the freezer overnight in a sealed bag to neutralize smells without water. For stains, blot immediately rather than rubbing, and treat with a wool-safe spot cleaner. Always test any product on an inside seam first.

Never hang wool sweaters, as hangers stretch the shoulders and neckline over time. Fold them instead and store flat on a shelf or in a drawer. For long-term storage, wool sweater storage tips include using breathable cotton garment bags rather than plastic, which traps moisture and encourages mildew.

Moths are drawn to the natural oils and food particles left on unwashed wool, so always clean sweaters before storing them for the season. Cedar blocks, lavender sachets, or dedicated moth traps in your storage area add an extra layer of protection.

How often should you wash wool sweaters? Far less than cotton or synthetics. Wool naturally resists odor and dirt, so washing after every three to five wears, or simply when visibly soiled, is usually enough. Over-washing does more harm than good.