How to Wash Merino Wool – and the Superwash Myth
By TaVare · updated 2026-08-10
You can usually wash merino wool at home, and it often takes more than people think – much merino is 'superwash'-treated and can go in the machine on a wool cycle. The key is to read the care label: superwash merino is more washable than raw wool, while untreated merino can still felt. Here is the difference, a safe method, and when the garment should go to a professional instead.
Superwash is not the same as ordinary wool
Merino wool has natural scales on the fibre that hook into each other when exposed to heat, movement and alkaline washing – this is what makes wool felt and shrink. Superwash merino is treated so the scales are smoothed down or coated, so the fibre does not lock together. That is why much merino today can be machine-washed on a wool cycle, and some garments even take a low tumble dry. The myth that 'all merino must be hand-washed carefully' is therefore false – but only the care label tells you what your garment actually takes.
- Superwash / 'machine washable': takes a wool cycle, cold to 30°C, low spin.
- Untreated merino (hand-wash symbol): wash gently by hand – it can still felt.
- If you are unsure which you have, treat the garment as untreated wool.
Merino needs washing less often than you think
Merino is naturally odour-resistant and moves moisture well, so it stays fresh for a long time. The most common mistake is washing merino too often – every wash wears the fibre a little. Airing between wears is often all the garment needs: hang it out overnight and the smell and moisture are gone. Wash only when the garment is actually dirty or stained, not after every wear. That keeps the garment looking good far longer than frequent washing ever will.
- Air the garment overnight after wearing instead of washing it.
- Spot-clean small marks with a little wool detergent and cold water.
- Do a full wash only when the garment is noticeably dirty or sweaty.
How to wash the merino
Whether you hand-wash or use the machine's wool cycle, the rules are the same: mild, cold and without mechanical harshness. Use a wool detergent – not ordinary laundry detergent, which is alkaline and often contains enzymes that break down the wool fibre.
- Turn the garment inside out and use a detergent made for wool.
- Run a wool cycle (or hand-wash) in cold water up to 30°C, with a low spin.
- Skip fabric softener – merino does not need it, and it forms a film.
- Do not leave the garment soaking, and do not rub at marks.
Dry flat so the garment keeps its shape
Wet wool is heavy, and if you hang a wet merino sweater up, the weight pulls the garment out of shape. Press – do not wring – the water out, roll the garment in a towel to draw out as much as possible, then lay it flat to dry on a dry towel. Reshape it to the right form while it is damp. Keep it away from radiators and direct sun; strong heat can shrink even superwash. If the merino pills over time, that is normal friction wear – remove it gently with a wool comb or de-piller.
- Lay the garment flat, never hanging wet.
- Reshape it to the right width and length while damp.
- Away from radiators, the tumble dryer (unless the label allows it) and direct sun.
When should the merino go to a professional?
Sometimes home washing is the wrong call: if the label says 'dry clean only', if you are unsure whether the garment is superwash, if the merino is structured or lined (suit jackets, coats), if a stubborn stain has set, or if the garment has already shrunk or lost its shape. Then you can send it to us. We clean merino gently according to the garment and its care label, and can handle a repair in the same round if needed. You order online, and you see the price before you order.
You see the price before you order.
Frequently asked questions
Can merino wool be machine washed?+
Often yes. Much merino is superwash-treated and takes the machine's wool cycle in cold water up to 30°C with a low spin. Check the care label – a hand-wash symbol means the wool is untreated and should be washed by hand.
What is the difference between superwash and ordinary merino?+
Superwash merino has had the scales on the fibre smoothed or coated, so it does not felt or shrink in the wash. Untreated merino has intact scales and can still felt with heat and movement.
How often should I wash merino wool?+
Less often than you think. Merino is naturally odour-resistant, so airing the garment overnight between wears is often enough. Wash only when it is actually dirty – frequent washing wears the fibre.
Do I need fabric softener for merino wool?+
No. Merino is soft on its own, and fabric softener forms a film on the fibre. Use a wool detergent without enzymes, and skip the softener.
Rather have us handle it?
You see the price before you order.