Run your fingers along a yarn and you feel fine fibres standing off the surface — that is hairiness. A little is normal; too much causes problems.
What causes hairiness
Short fibres and loose fibre ends protrude from the yarn body. Carded yarn is hairier than combed; higher twist and compact/ring spinning reduce it.
Why it matters
- Appearance: excess hairiness dulls fabric and blurs fine designs.
- Processing: hairy yarn sheds more, causing fly and more breaks in weaving.
- Pilling: loose fibres promote pilling in the finished fabric.
Reducing it
Choose combed or compact yarn, appropriate twist (see twist calculator), and clean spinning. Gassed (singed) yarn burns off surface hairs for a smooth finish — see mercerised and gassed cotton.
Need clean, low-hairiness yarn for fine fabric? We will match it.
More in our yarn guides and glossary.