How Often Should You Wash Merino Wool?

One of the best things about merino wool is that you don't need to wash it as often as regular clothing. It's a huge part of what makes merino so good in the first place.

Here's how to get it right.

The short answer

Most merino wool clothing only needs washing every 3 to 5 wears, sometimes more. Base layers worn for a hard, sweaty session might need washing sooner. A merino t-shirt worn for a normal day won't.

If in doubt, give it the sniff test. Merino's natural odour resistance means it often smells totally fine long after a synthetic top would need chucking in the wash.

Why merino needs less washing

Merino fibres are naturally antibacterial. The bacteria that cause body odour struggle to survive on merino wool the way they thrive on synthetic fabrics, so your clothing simply doesn't build up smell the same way.

Merino is also brilliant at managing moisture, wicking sweat away from your skin and letting it evaporate. Less trapped moisture means less bacteria, which means less odour, which means less washing.

The result: you can wear the same merino piece several times before it needs a wash, and it'll come out the other side smelling and feeling fresh.

Why washing less is actually better for your merino

It's not just about convenience. Washing less often is genuinely better for the garment itself:

• Less wear and tear. Every wash cycle puts stress on the fibres, so fewer washes mean your merino lasts longer.
• Less shrinkage risk. Wool fibres can tighten slightly with heat and agitation, so cutting down on washes reduces the chances of this happening.
• Less environmental impact. Fewer washes means less water and energy used, which fits nicely with why people choose a natural fibre like merino in the first place.

When you should wash it

A few situations where it's worth washing sooner rather than later:

• After a properly sweaty workout or long day of activity
• If it's visibly dirty or stained
• If you'll be storing it away for a while (always wash before long-term storage)

How to wash merino wool properly

When it is time for a wash:

• Use a wool-specific detergent and never fabric softener, which can damage the fibres.
• Wash on a cool, gentle cycle (30°C or below).
• Turn it inside out to protect the outer surface.
• Avoid the tumble dryer. Lay it flat to dry instead, as heat is what causes shrinkage.

To summarise

Merino wool is designed to be worn more and washed less. Trust the fabric, wash only when it needs it, and you'll get a garment that stays fresher for longer and lasts for years.