To wash merino wool, check the care label, wash on a gentle or wool cycle at a cool temperature with a wool-safe detergent, skip the fabric softener and dry flat away from direct heat. This guide covers how to wash merino base layers, tops and socks, and how to keep them soft and odour-free.
Last updated November 2026.
Always check the care label first
Care instructions differ between brands and blends, so follow the label on your own garment. The steps below suit most merino wool base layers, t-shirts and socks, but the label always comes first.
How to wash merino wool in the machine
- Turn it inside out. This protects the surface from rubbing and helps reduce pilling.
- Use a gentle or wool cycle. Choose a low spin speed and a cool temperature, typically 30 degrees or lower unless the label says otherwise.
- Use a wool-safe detergent. Pick a mild or wool-specific liquid. Avoid bleach and biological powders, which can damage wool fibres.
- Skip the fabric softener. It coats the fibres and can reduce the moisture-wicking that makes merino so useful.
- Wash with similar items. Keep merino away from zips, Velcro and rough fabrics that can snag it.
How to hand wash merino wool
Fill a basin with cool water and a little mild detergent, press the garment under the water, leave it for a few minutes, then rinse in cool water. Squeeze out the water gently. Do not wring or twist it.
How to dry merino wool
- Roll the garment in a clean towel to remove water.
- Reshape it and dry it flat, or hang it over a rail, away from radiators and direct sun.
- Do not tumble dry unless the label says it is safe. Heat can shrink wool.
How often should you wash merino?
Merino resists odour, so you can wear it more between washes than synthetic fabrics. Air it out after use and wash it when it looks or feels dirty, or after hard exercise.
How to get rid of odour and stains
Hang the garment in fresh air for a few hours to freshen it. For marks, dab with a little mild detergent and cool water before washing. Do not rub hard.
How to wash merino wool socks
Turn socks inside out and use a gentle wash at a cool temperature. Pair them up so they wear evenly, and dry them flat. This works for Smartwool hiking socks and the Hoggs of Fife 1903 merino socks, but check your label first.
How to stop merino pilling
Pilling is small balls of loose fibre, and it is normal on new wool. Turn garments inside out, avoid rough washing and remove any pills gently with a fabric comb or shaver.
Merino wool care FAQ
Can you machine wash merino wool?
Many merino garments are machine washable on a gentle or wool cycle. Always check the label first.
Does merino wool shrink?
It can if it is washed hot or tumble dried. Wash cool and dry flat to avoid it.
Can I use fabric softener on merino?
No. Softener coats the fibres and reduces how well the wool wicks moisture.
Can I iron merino wool?
Usually it does not need ironing. If you must, use a low heat and steam, and check the label first.
Why does my merino smell after washing?
Dry it fully and air it out. A damp garment stored away can smell musty.
Shop merino
Browse Icebreaker merino and Smartwool. Read what merino wool is, our Icebreaker base layer guide and the walking socks guide. More guides are in The Field Guide.
Need help?
Questions about caring for your merino? Email help@4elementsclothing.co.uk and we will be happy to help. Orders placed before 3pm Monday to Friday (10am Saturday) are dispatched the same day.
