Experts Share How to Wash Merino Wool Without Shrinking or Damaging It

Merino wool has quite the well-earned reputation. Soft yet strong, warm yet breathable, it’s a favorite for both everyday basics and high-performance layers. But as anyone who’s ever accidentally shrunk a beloved sweater knows, caring for wool requires a gentler hand than most laundry loads.

Merino wool comes from—you guessed it—merino sheep, and it's far softer and less itchy than many other wool fabrics. That, coupled with its temperature-regulating and moisture-wicking capabilities, make merino wool garments worth treasuring.

The good news? With the right approach, keeping these pieces soft, shapely, and looking brand new can be quite simple. Here, cleaning experts share their guidance for how to wash merino wool safely.

Start With Cool Water

The key to preserving merino wool’s über-soft texture lies in temperature and technique. "The safest way to wash merino wool without shrinking or damaging it is hand washing," says Marco Carmo, owner of Maid to Shine. "The most common mistake people make when cleaning merino wool is using hot water or heat during washing or drying. This can cause the wool fibers to contract and interlock, leading to shrinkage and damage to the fabric’s natural softness and structure."

Carmo recommends cool or lukewarm water that's below 85 degrees Fahrenheit.

Choose the Right Detergent

Not all detergents are created equal—especially when it comes to natural fibers like merino wool. (Regular detergents can be too harsh on the more delicate fibers.) “There are a few recommended detergents and products for wool care, and choosing one is dependent on a few different factors,” says Carmo, who says to look for gentle, bleach-free formulas that preserve the wool’s natural qualities.

"Any product that is wool-friendly is your way to go," adds cleaning and organizational expert Vanessa Garcia. "The one that comes to the top of my head is Wool and Cashmere Shampoo by The Laundress."

Use a Gentle Touch

Once the detergent is mixed in, gently submerge your garment and swirl it around without wringing or rubbing. "Let it soak for five to ten minutes," says Carmo. "Rinse thoroughly until the water runs clear and press out excess water gently—never twist or stretch."

If you prefer to let the washing machine do the work, Garcia says to proceed with care. "For merino wool, treat it as any other highly delicate item and wash it by hand with cold or lukewarm water," she says. "If you want to use a washing machine, wash in cold water only and use a delicate setting."

Always Dry Flat

Even the most thoughtfully washed merino piece can lose its shape if dried incorrectly. "Dry flat—it’s the only option to maintain its shape and softness," Garcia says simply.

As with washing, a gentle technique is crucial. "Gently press out (don’t wring!) excess water," instructs Carmo. "Lay the garment flat on a clean, dry towel, then roll the towel up with the garment inside to help absorb additional moisture."

Hanging is a no-go as you risk the garment losing its shape. "Once unrolled, place the garment flat on a dry towel or mesh drying rack," says Carmo. "Carefully reshape it to its original dimensions by straightening the edges and smoothing out any wrinkles. Allow it to air dry naturally in a well-ventilated area, keeping it away from direct sunlight and heat sources like radiators or dryers, which can damage the fibers."

A Few Extra Tips for Long-Term Care

Merino wool can be a low-maintenance luxury with the right know-how. Hand wash gently, dry flat, and follow the expert tips below, and your favorite pieces should stay soft, cozy, and perfectly shaped for years.

• Avoid hanging merino wool garments. “This can cause stretching and loss of shape,” warns Carmo.
• Keep away from heat. “Never use a tumble dryer, even on low heat, as it may shrink or felt the wool,” Carmo says. “Direct exposure to sunlight or heaters can also lead to fading and fiber brittleness.”
• Consult the professionals—and the care label. When in doubt, don’t hesitate to pay a visit to your local cleaners. If your piece is especially delicate, structured, or labeled “dry clean only,” trust the pros. “The safest way to clean merino wool is, in fact, also dry cleaning,” shares Garcia. 
• Wash less often. Thanks to merino wool’s natural odor resistance, it shouldn’t need as frequent washing as some of your other clothing. See what works for you and the garment.