How To · Fashion · Care
How to Care for Wool and Cashmere Year-Round
Wool and cashmere require different care than everyday fabrics, but the process is simpler than you think. Learn the exact steps to wash, dry, and store these investment pieces so they last decades, not seasons.
5 min read · IrisCashmere and wool are natural fibers that respond poorly to heat, agitation, and harsh chemicals—the exact conditions of a standard washing machine. But hand-washing these pieces takes less than ten minutes of active work, and the payoff is substantial: sweaters that don't pill, colors that don't fade, and fibers that stay soft instead of becoming stiff or matted.
The real secret isn't complexity. It's consistency. Wash your pieces correctly every time, store them flat or on proper hangers, and address small problems (loose threads, minor pilling) before they become irreversible damage. This guide walks you through each step, season by season.
Cashmere and wool don't need to be washed as often as you think—often just airing them out between wears is enough.
Step one · 3 minutes
Check the label and assess condition
Before you wash anything, read the care tag carefully. Some luxury pieces specify dry-cleaning only; respect that guidance. For pieces labeled hand-wash or machine-wash on delicate, do a spot test on an inconspicuous area with cool water and a drop of wool-specific detergent. Look for pilling, loose seams, or stains that need pre-treatment. If you spot damage, address it after washing, not before.
Cashmere and wool naturally resist odor. If a piece smells fine, skip the wash and simply lay it flat on a clean surface or hang it in fresh air for 24 hours.
Step two · 2 minutes
Fill a basin with cool water and detergent
Use a sink, bathtub, or large basin filled with cool water (around 65–70°F). Add a small amount of wool-specific detergent—roughly one teaspoon for a standard sweater. Wool detergent is pH-neutral and gentler than regular laundry soap, which can strip natural oils and cause shrinkage. Stir gently to distribute the detergent evenly. Never use hot water, which causes fibers to felt and shrink permanently.
Avoid bleach, fabric softener, and enzyme-based detergents. These damage protein fibers. Castile soap or specialized wool wash (like Eucalan or The Laundress) work equally well.
Step three · 5 minutes
Submerge and soak gently
Place the garment in the water and gently press it down so it's fully submerged. Let it soak for 10–15 minutes. Do not agitate, wring, or scrub—this causes felting and stretching. If there are visible stains, gently rub the affected area between your fingers, not against the fabric itself. After soaking, drain the soapy water carefully and refill the basin with cool clean water for rinsing.
For heavily soiled areas (underarms, collars), make a paste of detergent and water and apply it directly, then let it sit for five minutes before soaking the whole piece.
Step four · 5 minutes
Rinse thoroughly in cool water
Submerge the garment in fresh cool water and gently squeeze the soapy water out. Repeat this process two or three times until the water runs clear and there are no soap bubbles. Each rinse should take about a minute. This step is crucial—leftover detergent residue makes fibers stiff and dull. Be patient; thorough rinsing is what separates soft cashmere from cardboard-like sweaters.
Add a drop of white vinegar to the final rinse to restore pH balance and enhance softness, though this is optional.
Step five · 3 minutes
Remove excess water without wringing
Lift the garment gently from the water and let it drip briefly. Lay it flat on a clean, dry towel. Gently press down on the garment to transfer moisture to the towel—do not wring or twist. Roll the towel with the garment inside and press gently to absorb more water. Unroll and transfer the piece to a fresh, dry towel laid flat on a clean surface. Never hang wet cashmere or wool; the weight of the water will stretch it irreversibly.
Use white towels to avoid dye transfer. If you're drying multiple pieces, use separate towels.
Step six · varies
Dry flat and store properly
Leave the garment on the flat towel in a well-ventilated, temperature-stable area away from direct sunlight and heat sources. Drying typically takes 24–48 hours depending on thickness and humidity. Once dry, fold the piece and store it in a breathable container (cotton storage bags, not plastic) in a cool, dark closet. For year-round storage, add cedar blocks or lavender sachets to deter moths. Avoid wire hangers, which create permanent creases; use padded hangers for pieces you rotate regularly.
Reshape the garment gently while it's still slightly damp if it's lost its form. Smooth out wrinkles with your hands rather than an iron.
How to know your piece is properly cared for
A well-maintained wool or cashmere piece should feel soft to the touch, retain its original shape, and show minimal pilling or fading even after multiple washes. The fabric should move naturally against your skin without stiffness or brittleness. If your piece feels scratchy, has lost elasticity, or has visible shrinkage, the damage is usually permanent—but proper care from this point forward will prevent further deterioration.
Questions at the mirror.
My cashmere sweater has developed pilling. Can I fix it?
Yes, but only minor pilling. Use a cashmere comb or a fine-tooth sweater stone, moving gently in one direction. For heavy pilling, a fabric shaver (like a Gleener or similar tool) works, but use it sparingly—aggressive use damages the underlying fibers. Prevention is easier than cure: wash less frequently and avoid friction from backpacks or rough surfaces.
I accidentally put my wool sweater in the dryer. Is it ruined?
Likely, yes. Heat causes permanent felting in wool and cashmere. However, if it's only slightly shrunk and still wearable, don't attempt to stretch it back—you'll damage the fibers further. Accept the new fit or repurpose the piece. Going forward, always air-dry.
How often should I actually wash wool and cashmere?
Much less than you think. Cashmere can go 8–10 wears between washes; wool can go 4–6. If a piece doesn't smell or have visible stains, simply air it out. Overwashing is the primary cause of fiber damage and color fading.
Can I machine-wash wool on delicate?
Technically, yes, if the label permits. Use cold water, the delicate cycle, and wool-specific detergent. However, hand-washing gives you more control and is gentler. If you use a machine, place the garment in a mesh laundry bag and never use the spin cycle.
What's the difference between cashmere and merino wool care?
Both use the same hand-wash method with cool water and wool detergent. Merino wool is slightly more durable and less prone to pilling, so it can tolerate slightly warmer water (up to 80°F) and occasional machine washing on delicate. Cashmere is more delicate and requires cooler water and gentler handling.