SAEDNEWS: Gentle washing, cool water, and careful drying can help preserve the size and shape of wool clothing.
According to SAEDNEWS, wool fibers can shrink or become misshapen when exposed to heat, vigorous agitation, or sudden temperature changes. The safest approach is to check the garment’s care label first and then use the gentlest suitable washing method.
Start by checking whether the garment is labeled machine washable or hand wash only. If there are specific instructions on the label, follow them rather than relying on a general wool-washing method.
Before washing:
Close zippers and fasteners.
Turn the garment inside out when appropriate.
Remove visible dust or loose dirt gently.
Use a mild detergent formulated for wool or delicate fabrics.
Avoid bleach and harsh cleaning products.
If the garment can be hand-washed, use this simple process:
Fill a basin with cool or lukewarm water. Avoid hot water, which can contribute to wool shrinkage.
Add a small amount of suitable detergent. Mix it into the water before adding the garment.
Submerge the wool clothing gently. Let the water and detergent work through the fibers without vigorous rubbing or twisting.
Rinse carefully. Use water at a similar temperature to the washing water to reduce sudden temperature changes.
Remove excess water without wringing. Press the garment gently instead.

Washing is only part of preventing wool from shrinking. Avoid hanging a wet wool sweater, because its weight can stretch the fabric and alter its shape. Instead, gently press out excess water and lay the garment flat on a clean, dry towel. Reshape it while it is damp, paying attention to the sleeves, shoulders, and overall dimensions.
Keep wool clothing away from direct high heat, such as radiators or strong heat sources. A cool, well-ventilated place is generally more suitable for drying.
Several habits can increase the risk of damage:
Washing wool in hot water
Using a vigorous washing cycle when the label does not permit it
Twisting or wringing the garment
Moving the garment suddenly between very different water temperatures
Drying it with strong direct heat
Hanging a heavy, wet wool garment
For machine-washable wool, choose the wool or delicate cycle specified by the care label and use the recommended water temperature. When the label calls for special care, following those instructions is more reliable than using a standard washing routine.