Is merino wool itchy?
Most of us have worn a wool sweater that itched. Usually a thick, traditional knit, and after an hour all you wanted was to take it off. It left many of us believing that wool is necessarily itchy. But merino wool is actually very different, and we’ll explain why.
Why wool itches in the first place
For most people, it isn’t an allergy. It’s related to the thickness of the wool.
Wool fibres come in different thicknesses, measured in microns. One micron is a thousandth of a millimetre. When a thick fibre end presses against your skin, it doesn’t bend. It pokes. Multiply that by a few thousand fibre ends across your back, and your skin starts to feel it.
The tipping point sits around 30 microns. Thinner fibres tend to flex out of the way. Thicker ones push back. Traditional wool, the chunky-jumper kind, often has plenty of fibres on the wrong side of that line.
Merino is different
Merino sheep grow far finer wool. Most merino lands somewhere between 17 and 24 microns, a small fraction of the width of a human hair. That’s why it drapes, stretches and feels soft against the skin. We explain the numbers in Merino microns and weights, explained.
But here’s what a lot of brands skip over: “merino” on a label isn’t a promise.
A merino garment can still itch if:
- the fibres sit at the coarse end of that range
- the batch is inconsistent, so a few thick fibres sneak in (and a few is all it takes)
- it’s finished or blended cheaply
- the knit is loose and rough, leaving more fibre ends sticking out
Two shirts can both say 100% merino and feel nothing alike.
We know because we made the itchy one
This part we learned firsthand. The first merino we worked with itched. Not badly, but enough that we felt it at the collar and knew our customers would too.
So we went back to the start, changed where our wool comes from and kept testing until the itch was gone. Where we landed: [XX]-micron merino. At that fineness we stopped noticing the fabric at all.
How to tell before you buy
You can’t touch a shirt through a screen. So here’s what to look for instead.
- Find the micron count: good brands publish it. As a rough guide, around 18.5 microns or finer is very soft, and the higher you go, the more sensitive skin will notice. If a brand won’t tell you, ask why.
- Look at the knit: smooth and tight beats fuzzy and open.
- Check the blend: a little nylon for strength or elastane for stretch is fine. Mystery fibres aren’t.
- Search the reviews for “itch”: customers tend to mention it.
- Test it properly: wear it for a full day before drawing conclusions.
If you have very sensitive skin or eczema, start with the finest merino you can find.
So, is merino wool itchy?
Bad merino can be. Good merino isn’t.
Itchy wool is mostly about coarse fibres, not wool itself.
So next time you reach for synthetics because “wool itches”, try one good merino piece instead. Check the micron count. Wear it all day. Then notice whether you thought about it at all.