In 2004, farmers in New Zealand found a Merino sheep named Shrek hiding in a cave. He had escaped the shearers for six years. His fleece weighed around 27 kilos, enough for about twenty men’s suits. Eleven years later, a sheep called Chris was found wandering near Canberra with more than 40 kilos of wool on his back. Vets feared he might not survive it.
These stories get shared as curiosities. I read them as evidence. A domesticated sheep that is never shorn does not live a freer life. It becomes a prisoner of its own coat.
A sheep that isn’t shorn is a sheep in danger
Wild sheep such as the mouflon shed their coats naturally each spring. Centuries of breeding changed that. Most domesticated breeds, Merino above all, grow wool continuously and cannot shed it.
Left unshorn, the fleece becomes a hazard. It traps heat and causes heat stress in summer. It collects dirt and moisture, which attracts blowflies. Their larvae can eat into the animal’s skin, a painful condition called flystrike. Heavy, matted wool also restricts movement. A sheep that falls on its back may be unable to get up again.
Shearing prevents all of this. Wool has no nerves, so cutting it is closer to a haircut than an ordeal. A skilled shearer finishes a sheep in a few minutes, usually once a year. The animal walks away cooler, cleaner and healthier. Shearing does not kill the sheep, and the fleece starts growing back almost at once.
Renewable by design
This is what makes wool one of the few genuinely renewable fibres in fashion. A sheep turns grass, water and sunlight into a new fleece every year of its life. Nothing is extracted and nothing is depleted.
Compare that with polyester, which now makes up more than half of all fibre produced globally. It is made from oil, a resource that does not grow back on a hillside. Wool accounts for only around one percent of the market. That imbalance tells you more about the economics of cheap fashion than about the merits of either material.
The end-of-life test synthetics fail
The real difference shows when a garment reaches the end of its life. Wool is made of keratin, the same protein as human hair. Buried in soil, it biodegrades within months to a few years and releases nutrients as it breaks down. Synthetic fibres shed microplastics with every wash and persist for centuries after disposal.
Wool also performs well during its life:
- Less washing. It resists odour naturally, so it needs far less laundering than cotton or synthetics.
- Comfort. It absorbs moisture vapour without feeling wet.
- Safety. It is naturally flame-resistant.
- Longevity. A well-made wool suit can be altered, repaired and worn for decades.
The most sustainable garment is the one you never have to replace.
Where “ethical” has to be earned
I won’t pretend wool is flawless, because the fibre is only as ethical as the farm it comes from.
Sheep produce methane, and researchers still debate how much well-managed grazing offsets it. Raw fleece has to be scoured, a washing process that uses water and needs responsible wastewater treatment. Some shearers are paid per animal, which rewards speed over care.
The most serious problem is mulesing. This practice, used mainly on Australian Merino, cuts strips of skin from lambs to prevent flystrike, often without pain relief. New Zealand banned it in 2018. Better breeding and husbandry make it avoidable elsewhere too.
So the honest sentence is this: wool is ethical when sheep are treated well. That condition is the whole point. Look for:
- mulesing-free sourcing
- certifications such as the Responsible Wool Standard or ZQ
- suppliers who can tell you which farms their wool comes from
The real problem isn’t the fibre
Even perfect wool is wasted if it becomes a coat nobody buys. Every season, the industry produces millions of garments that end in discount bins, incinerators and landfill, including garments made from beautiful, responsibly sourced wool.
This is why I keep returning to the same argument. The material matters, but the business model matters more. Made-to-measure and made-to-order production uses wool only for garments that already have an owner. Such a garment is cut for one body and built to be altered as that body changes. Fibre and model then do the job together, from the sheep’s annual haircut to a jacket worn for twenty years.
The sheep needs its shearing. We need to stop wasting what it gives us.
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