Does wool shrink? Fact or fiction
Wool is one of the most valued natural materials — warm, soft and breathable, it works well in clothing for every season. And yet a number of myths surround it. One of the most common: does wool shrink? Here we clear it up, look at how different types of wool behave and share how to care for them so they keep their shape and softness for years.
Why do people worry about wool shrinking?
Natural wool — merino and alpaca in particular — has a unique fibre structure. Each fibre has a scaly surface with a soft protein core beneath. In the wrong washing conditions those scales can interlock, causing the fibres to matt together and the garment to become smaller. This process is called felting, and it's the main reason people assume wool shrinks on its own.
But it's neither inevitable nor irreversible. Proper wool care keeps garments their original size and shape.
Does all wool behave the same way?
No — different wools behave quite differently.
Merino wool — fine and soft, and fairly resistant to shrinkage when washed at the right temperature with gentle detergents.
Standard (sheep) wool — thicker fibres can be more prone to felting, especially at high temperatures or with vigorous agitation.
Alpaca — smoother, less scaly fibres mean a lower shrinkage risk than standard sheep wool.
The key point: wool doesn't shrink on its own — it takes external factors like high heat, friction or harsh detergents to cause it.
How to wash wool without it shrinking
1. Water temperature
Wash wool in cold or lukewarm water (30°C maximum). Hot water causes the fibres to tighten and matt.
2. Gentle detergent
Use a specialist wool wash liquid — one that preserves the fibre scales and maintains natural softness.
3. Avoid friction and high spin
Don't rub wool vigorously and keep spin speed low. Hand washing or a dedicated wool programme is best.
4. Dry flat
After washing, lay the garment flat on a towel in its natural shape. Hanging can stretch shoulders or distort the cut.
5. Storage
Store woollen garments in breathable wardrobes or fabric bags to protect from moisture and crushing.
The myth of shrinking wool is only half true — wool doesn't shrink by itself, only through improper washing or drying. Different wools react to these factors to different degrees — which is why it pays to know your fibre and follow a few simple care rules. Merino, alpaca or standard sheep wool: cared for properly, all of them stay beautiful, soft and the right size for years.
