Can You Machine Wash Wool

The short answer: sometimes. Whether you can machine wash wool depends on the type of wool and what the care label says. Here's everything you need to know.

When You CAN Machine Wash Wool

Machine washing is safe only for wool labeled:

• "Machine washable"
• "Superwash wool" — treated to resist shrinkage
• "Washable wool"

These wools have been treated to prevent the fiber scales from interlocking during agitation, making them safe for gentle machine cycles.

When You CANNOT Machine Wash Wool

• "Hand wash only" — machine agitation will cause shrinkage or felting
• "Dry clean only" — take to a professional cleaner
• No label / unknown wool — hand wash to be safe
• Loosely knit or delicate wool — even gentle cycles can distort the shape
• Wool felt or boiled wool — already felted, but machine washing can still distort

How to Machine Wash Wool Safely

1. Check the care label first. Only proceed if it says machine washable.
2. Place in a mesh laundry bag. This protects the garment from agitation and friction against other items.
3. Use a wool-specific detergent. The Laundress Wool & Cashmere Shampoo is enzyme-free and pH-balanced for wool fibers.
4. Select the wool or delicate cycle. Cold water only — never warm or hot.
5. Use the lowest spin speed. High spin speeds cause stretching and distortion.
6. Remove promptly. Don't leave wet wool sitting in the machine.
7. Lay flat to dry on a sweater drying rack. Reshape while damp. Never hang or put in the dryer.

What Happens If You Machine Wash Non-Washable Wool

• Shrinkage — often severe and irreversible
• Felting — fibers mat together into a dense, stiff fabric
• Distortion — garment loses its shape
• Pilling — increased surface friction causes pills

When in Doubt: Hand Wash

If you're unsure whether your wool is machine washable, hand wash it. Hand washing with cool water and wool detergent is always safe for any type of wool.

Frequently Asked Questions

What cycle should I use to machine wash wool?

The wool cycle or delicate cycle with cold water and the lowest spin speed. Never use a normal or heavy cycle — the agitation will cause shrinkage and felting.

Can I machine wash a wool sweater?

Only if the label says "machine washable" or "superwash wool." If the label says "hand wash only" or "dry clean only," do not machine wash. When in doubt, hand wash.

Do I need a mesh bag to machine wash wool?

Yes — a mesh laundry bag protects wool from friction and agitation against other items in the machine. It significantly reduces the risk of pilling and distortion.

Can I put wool in the dryer?

No — never put wool in the dryer, even on a low heat setting. The heat and tumbling cause irreversible shrinkage and felting. Always lay flat to dry on a sweater rack.

My wool shrank in the machine — can I fix it?

Sometimes — if caught early, you may be able to unshrink wool by soaking in lukewarm water with a small amount of hair conditioner, then gently stretching back to shape while wet and laying flat to dry. Results vary depending on how much it shrank.