That ‘Mushroom Leather’ Bag Might Be Mostly Plastic—The 3-Word Label Trick Brands Use (and the PFAS backlash coming for it next)
“Made with mycelium” can be technically true while the structure, durability, and water resistance come from PU/PVC layers. Here’s how to decode the composite—and why regulators are tightening the screws on partial-truth material claims.
Key Points
- 1Recognize the trick: “made with mycelium” can be true while PU/PVC layers supply most structure, durability, and water resistance.
- 2Check the build: mycelium “leather” is often a composite—backing textiles, binders, lamination, and coatings can dominate mass and performance.
- 3Demand numbers: look for percentages and finish thickness; EU rules increasingly target partial-attribute claims marketed as whole-product benefits.
The handbag is “mushroom leather.” The sneaker is “made with mycelium.” The wallet is “crafted from fungi.” The language is so vivid—and so specific—that it’s easy to picture an entire product grown, pressed, and stitched from mushrooms alone.
Then you look closer. Sometimes there’s a footnote. Sometimes there’s a materials tab buried below the fold. And often, the story gets more complicated: a mycelium-based layer paired with a textile backing; a protective coating; a polymer binder; a laminated composite whose durability comes, in no small part, from plastic.
That isn’t a scandal. It’s manufacturing. But the gap between what consumers imagine and what many products actually contain is widening—helped along by a phrase that does a lot of quiet work in modern marketing: “made with.”
“A product can be ‘made with mycelium’ and still be mostly plastic in the parts that matter.”
— — TheMurrow Editorial
“Mushroom leather” isn’t a regulated material term in the way shoppers typically understand leather (animal hide). It has become an umbrella label for a spectrum of mycelium-based materials, ranging from high-bio-content sheets to plastic-heavy composites. If you care about sustainability—or simply want to know what you’re buying—this is the moment to stop taking the romance at face value and start reading the fine print like it matters.
What “mushroom leather” actually means (and why it’s so slippery)
Unlike animal leather—where “leather” is commonly understood by consumers as a hide-based material—“mushroom leather” has no single, standardized consumer definition in the research here. The term functions more like “plant-based”: broad, appealing, and flexible enough to cover a wide range of formulations.
That flexibility matters because a finished “mushroom leather” good is often not a single material. It’s a composite, and composites can be dominated by whatever delivers structure, durability, and water resistance. In today’s leather-alternative market, that often means polyurethane (PU) or PVC.
What the LCA research says about “vegan leather”
Those numbers don’t invalidate every “mushroom leather” claim. They do reveal why the label can mislead. If the polymer layer is doing the heavy lifting, “mushroom” can become a supporting character in a story that reads like a solo act.
The plastic problem isn’t hypothetical—it’s structural
PU and PVC: why they show up so often
- Thin PU finish layer: often used for scratch and water resistance; in some cases it can be negligible by mass.
- Structural PU layer: thicker (the LCA cites 100–500 µm) and can account for ~10–50% of a material’s thickness and mass.
- PVC: another common polymer in leather alternatives, valued for durability but widely scrutinized for environmental reasons (the research notes its prevalence in the market category).
The result is a market where “vegan,” “plant-based,” and “mushroom” products can still be materially—and environmentally—tethered to petrochemicals.
“In many leather alternatives, plastic isn’t just the topcoat. It’s the architecture.”
— — TheMurrow Editorial
This is where consumer frustration tends to land. People aren’t naïve; they understand finishes and linings. What they object to is the mismatch between the implied claim (“the bag is mushrooms”) and the technical reality (“the bag is a composite, and the polymer may dominate performance and mass”).
The “three-word label trick”: how “made with” does so much work
Three phrases that blur composition
- “Made from [X]” (often interpreted as “mostly X”)
- “Made of [X]” (strongest to consumers; still misused in marketing copy vs. a bill of materials)
These phrases exploit a predictable consumer habit: we interpret material claims as whole-product claims unless told otherwise. A sneaker described as “made from mycelium” reads like it’s primarily mycelium, not mycelium plus a textile plus a polymer film plus adhesives plus coating.
That interpretive gap is increasingly risky for brands—especially in Europe. The EU’s updated consumer-protection approach explicitly targets situations where marketers present a partial attribute as a whole-product benefit. The Council of the EU highlights the problem of claims such as “made with recycled material” when only part of a product has that feature. The logic maps cleanly onto “made with mycelium” if the mycelium content applies only to one layer of a composite.
None of this automatically makes “made with” illegal. It does raise the bar: clarity, substantiation, and prominent qualifiers matter more. For brands, ambiguity becomes a liability. For readers, it’s a cue to read beyond the headline.
Key Insight
A best-case example: MycoWorks Reishi, and what “low plastic” can look like
MycoWorks describes Reishi (Fine Mycelium) as being grown from four basic inputs: recycled sawdust, bran, spawn, and minimal water. The company also acknowledges a key point many marketing pages bury: Reishi can incorporate an added textile to achieve different performance characteristics.
That matters because textile backing changes how the material behaves and how it should be described. It can also shift how consumers should think about “what it is.” A mycelium material with a textile backing is still mycelium-based—but it’s not a single-origin sheet.
The numbers: composition and coatings
The 2022 peer-reviewed LCA in Environmental Sciences Europe reinforces the significance of the coating thickness distinction, describing Reishi as having near-zero plastic (<1%) in the coating—contrasting it with the structural PU layers common in other leather alternatives.
A reader should take two lessons from this:
1. Low-plastic mycelium materials exist, and the details can be disclosed.
2. Even the best-case product may still be a composite (mycelium + textile + finish), which complicates the simplistic “grown, not made” story.
“The most credible biomaterials don’t pretend to be pure; they tell you what they’re made of.”
— — TheMurrow Editorial
Why composites aren’t automatically bad—but secrecy is
A mycelium-based material may need:
- a textile backing for strength and sewability,
- a finish for stain and water resistance,
- a binder to hold fibers or particles together,
- lamination to meet performance expectations.
Consumers can accept that—often happily—if they understand what they’re buying and why each layer exists.
The trouble starts when the marketing language suggests the mycelium is the whole substance, while the technical reality is that mycelium is one component among several, possibly not even the dominant one. The research underscores how common polymer-dominant constructions are in “vegan leather,” and it’s not hard to see why shoppers feel misled when they learn that “plant-based” sometimes means “plant plus a lot of PU.”
For brands, the path forward isn’t to abandon mycelium claims; it’s to describe composites like composites. For consumers, the practical shift is simple: treat “mushroom leather” as a category that demands a materials breakdown, not a single substance you can assume.
The real issue
Case study in scale: Bolt Threads’ Mylo and the reality check
The research provided here flags Mylo as a “cautionary tale about scale + composites,” with reference to Vogue Business. Even without additional specifics included in these notes, the editorial lesson is clear and widely applicable: scaling a biomaterial is not just a scientific question. It is a supply-chain, performance, and cost problem.
Those pressures are exactly why plastic-heavy composites persist. When brands need predictable performance at volume, polymers offer known engineering properties and established manufacturing pathways. Mycelium-based materials that minimize plastic must prove they can meet performance needs without falling back on thick polymer structures.
So when readers encounter a new “mushroom leather” launch, skepticism isn’t cynicism—it’s literacy. Ask two questions: what is the composition, and what had to be added to make it function like a bag, a shoe, or a jacket in the real world?
Editor’s Note
How to shop smarter: a reader’s checklist for mushroom leather claims
Look for specific composition, not poetry
- Percentages (by weight or composition), such as MycoWorks’ example 60% mycelium / 40% cotton.
- Disclosure of backing materials (cotton, polyester, other textiles).
- Disclosure of coatings/finishes, including whether they’re PU/PVC and how substantial they are.
Translate marketing phrases into questions
- “Made from mushrooms” → Is it mycelium-based, or a PU product with a mycelium narrative?
- “Mushroom leather” → What is the full bill of materials: backing, finish, binder, adhesives?
Watch for the hidden structural layer
Finally, consider geography and regulation. The EU’s consumer-protection direction is increasingly hostile to broad, product-wide green impressions based on partial truths. Brands selling globally may adjust disclosures to reduce risk. Readers benefit when that pressure forces clarity.
Quick checklist: what to verify before you buy
- ✓Look for percentages by weight/composition (not just “made with”)
- ✓Identify backing textiles (cotton, polyester, blends)
- ✓Check coatings/finishes and whether they’re PU/PVC
- ✓Ask whether plastic is a thin finish or a structural layer
- ✓If details are missing, assume the headline is incomplete
Where this leaves “mushroom leather”: promise, pressure, and a demand for honesty
At the same time, the research points to credible, more transparent approaches. MycoWorks’ Reishi disclosures—inputs, optional textile integration, example composition, and <1% by weight finish—illustrate what a higher-information standard can look like. The Environmental Sciences Europe LCA provides a framework for evaluating whether plastic is merely a finish or a structural necessity.
The next chapter of “mushroom leather” won’t be written by better slogans. It will be written by better labels, clearer bills of materials, and consumers who insist that “made with” comes with numbers.
Frequently Asked Questions
Is mushroom leather actually made of mushrooms?
Often, it’s made from mycelium, the root-like network of fungi, rather than the mushroom fruiting body. Many finished goods are composites, combining mycelium-based layers with textile backings and coatings. The headline claim may be true in part, but it rarely tells you the full material story without a composition breakdown.
Why do so many mushroom or vegan leathers contain plastic?
Durability and water resistance are hard problems. A peer-reviewed LCA in Environmental Sciences Europe (2022) notes that virtually all “vegan leathers” on the market are made from PU and/or PVC. Polymers provide predictable performance and work well with existing manufacturing. The key question is whether plastic is a thin finish or a thick structural layer.
What does “made with mycelium” really mean?
It usually means some portion of the material incorporates mycelium. It does not automatically mean the whole product—or even most of the product—is mycelium-based. Treat it as an invitation to ask for percentages, backing materials, and coatings, especially when the product is marketed as primarily “mushroom.”
Are there low-plastic mycelium materials?
Yes. MycoWorks discloses that its Reishi material can use a protective finish under 1% by weight, and an example SKU composition is 60% mycelium / 40% cotton. The Environmental Sciences Europe LCA also distinguishes thin finishes from thick structural PU layers, positioning Reishi as near-zero plastic in its coating.
How can I tell if a product is mostly plastic?
Look for a detailed materials list and any mention of PU or PVC, especially as a structural component. The 2022 LCA describes structural PU layers of 100–500 µm that can contribute ~10–50% of thickness and mass in some alternatives. If the product lacks composition details, assume the headline is incomplete.
Are “made with” environmental claims facing more regulation?
In Europe, yes—pressure is rising. The EU’s consumer-protection approach calls out the problem of presenting partial attributes as whole-product benefits (for example, “made with recycled material” when only part qualifies). That logic applies to biomaterial claims when “made with mycelium” creates an overall impression that the entire product is mycelium-based.
