Why Silk Has a "Bad Environmental Rap" — and What Matters More
Quick answer: Silk's poor environmental reputation comes largely from sustainability rating tools that scored it harshly on the basis of narrow data — a ranking many in the industry disputed. The honest picture is more nuanced: silk's footprint depends heavily on how it's farmed, powered, dyed and, above all, how long it's kept. As a natural protein fibre it biodegrades and sheds no plastic microfibres, unlike polyester. It also raises genuine questions — energy, water, and animal welfare — that deserve straight answers rather than either dismissal or greenwashing. Silk's strongest environmental case is simple: buy well, keep it for years.
Where silk's bad reputation actually came from, what the criticisms get right, and the one thing that matters more than any of them.
Silk is one of fashion's quiet contradictions: ancient, natural, biodegradable — and yet, in modern sustainability conversations, frequently cast as a villain. If you have seen a headline suggesting silk is among the worst fabrics for the planet, you have met the reputation. The truth is more interesting than the headline, and worth setting out plainly, including the parts that do a silk brand no favours.
Where the bad rap came from
A great deal of it traces to a single source. The influential sustainability rating system widely used across the fashion industry — built on life-cycle assessment data — once ranked silk as one of the most environmentally damaging materials of all, worse than polyester. It was a startling result, and it spread. What spread less widely was the criticism that followed: that the score leaned heavily on a narrow set of data drawn from one region's farming practices, and did not remotely represent how all silk is produced. An entire natural fibre was handed a reputation on the strength of a limited dataset. That is how a nuanced material ends up with a blunt label.
The lesson is not that silk is secretly blameless. It is that “silk” is not one uniform thing, and a single score can't capture a material whose footprint changes enormously with how it is farmed, powered, dyed, shipped, and used.
What the criticisms get right
Two areas deserve honest attention rather than defensiveness.
Energy and processing. Silk can be energy-intensive to produce, particularly in the drying and processing of cocoons and in climate-controlled rearing. Where that energy comes from matters a great deal, and it varies widely between producers.
Dyeing and finishing. This is the stage people underestimate. A surprising share of any fabric's impact — silk included — comes not from the fibre but from how it is coloured and finished, and from whether the wastewater is treated properly. Deep or complex colours generally carry a heavier footprint than pale, simple ones. This is also precisely where a responsible maker can make the biggest difference: cleaner dyehouses, better wastewater practice, fewer harsh finishes.
Water gets cited constantly, and here the honest answer is “it depends” — on whether you count rainfall or irrigation, on the region, and on whose dataset you trust. It is a real question, not a settled number.
The part in silk's favour, honestly stated
Silk is a natural protein fibre, and that carries two genuine environmental advantages worth stating plainly. It is biodegradable in principle — though dyes, blends and finishes complicate that, so it is not a clean claim. And, unlike polyester, it sheds no plastic microfibres in the wash. The synthetic “silky” and “satin” alternatives so often sold as the cheaper option are petroleum-based plastics that release microplastics every time they are laundered — one of the quiet environmental costs that rarely makes it into the comparison. Knowing your fabric is genuinely silk rather than plastic pretending to be silk is itself part of the picture; how to tell is in how to tell if silk is real.
The ethics question, kept separate
It is worth saying clearly, because the two get muddled: environmental impact and animal welfare are related but not the same question. Traditional silk production generally involves harvesting the cocoon before the moth emerges. For some people that is a genuine deal-breaker; for others, the priorities are natural fibres, durability and biodegradability. There is no single correct position here — only informed choices and honest transparency about what the process involves. A brand that pretends the question doesn't exist is one to be wary of.
The thing that matters more than any of it
Here is where the whole conversation resolves, and it is almost boringly simple: longevity. The most sustainable garment is the one you don't replace. Silk's real environmental argument isn't that it scores well on a spreadsheet — it's that a good piece, cared for properly, stays beautiful for years or even decades, quietly displacing the stream of cheap, disposable textiles that would otherwise take its place. A silk pillowcase kept and used for five years is a fundamentally different proposition from one bought and binned in a season.
That is why the practical sustainability questions are less “what's the LCA score” and more: How well was it made? How long will I use it? How gently will I care for it? A well-made 22-momme piece, washed kindly — the method is in how to wash and care for silk — and kept in rotation for years is doing more good than any certificate. It is also, not by coincidence, the case for buying quality in the first place, weighed up honestly in are silk pillowcases worth it.
How we think about it at LS Silk
Our position is deliberately modest: make silk worth keeping. That means everyday, repeat-wear pieces rather than one-season novelties, OEKO-TEX® certified fabric tested for harmful substances, and care guidance that helps silk last in real homes. We would rather sell you one pillowcase you keep for years than three you don't. If you ever have a question about our materials or process, we welcome it — sustainability is a conversation to be had, not a badge to be worn.
Frequently asked questions
Is silk bad for the environment?
Not inherently. Its footprint depends on how it's farmed, powered and dyed, and on how long it's kept. Some sustainability indexes scored it harshly on narrow data, a ranking widely disputed. Longevity is its strongest environmental argument.
Why did silk get rated worse than polyester?
An influential industry rating system ranked it poorly based on a limited regional dataset. Critics argued it didn't represent silk production broadly — and, unlike polyester, silk sheds no plastic microfibres.
Does silk shed microplastics?
No. Pure silk is a natural fibre and doesn't release plastic microfibres in the wash, the way polyester “satin” does. Blends, threads and trims can differ, so check composition.
Is silk biodegradable?
In principle, yes — it's a natural protein. Dyes, finishes and blends complicate that, which is another reason durability and repair matter more than end-of-life alone.
What's the most sustainable way to buy silk?
Buy fewer, better pieces you'll use for years, care for them gently, and keep them in rotation. Quality and longevity outweigh most other factors.
Our mulberry silk pillowcases are 22 momme, 6A grade and OEKO-TEX® Standard 100 certified — made, above all, to be kept.
Silk doesn't need a PR makeover so much as a little clarity. The criticisms exist for real reasons, mostly around energy and processing, but they are not the whole story — and when silk is made responsibly and worn for years, it sits comfortably in a more considered wardrobe: one built on fewer, better, longer-kept things.