Material Dossier -- 2026

Mylo™ (discontinued)

Production has been wound down and the material is not available for new programmes. Several brands had designed it in before it disappeared, which is the clearest illustration that supply continuity belongs in an assessment alongside performance and certification.

Material Category: Mycelium leather

Composition by Mass

Declared Material Matrix

Mycelium (fungal biomass)

Bolt Threads described Mylo only qualitatively — "predominantly mycelium" — and never published a mycelium percentage. Recorded without a share. (Mycelium is fungal, not plant; classed under the dataset's existing bio-based term for want of a fungal one.)

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Plant-Based

Lyocell

Named by the supplier as a constituent — "currently contains some lyocell". No share was ever published.

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Plant-Based

Water-based polyurethane finish

Named by the supplier as a constituent, applied for strength and durability. No share was ever published.

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Virgin Synthetic
Declared Total —

Certificates Listed

Check each certificate with its issuer before relying on it

No certificates have been documented for this material.

Technical Data Sheet

Specifications

Technical specifications for Mylo™ (discontinued)
Property Value Unit Standard Ref
Commercial status Production wound down
Availability Not available for new programmes
Bio-based content (supplier claim, withdrawn product) Up to 80% % Supplier marketing claim, Mylo Impact page (archived 2023); a stated ceiling for total bio-based content, not a mycelium share, and never independently verified. Bolt Threads also claimed "no synthetic scrim or backing".
Application Guidance -- Verified Boundaries

Where This Material Works -- and Where It Must Not

Suitable For

Listed for reference only. Not available for specification.

Not Suitable For

Not available. Any offer of new Mylo™ stock should be treated as remnant inventory and verified before purchase.

Known Limits

Documented Constraints & Untested Conditions

Included deliberately as a record rather than an omission. Mylo™ was designed into products by several well-known brands before its producer wound the programme down, which stranded those designs. This is the clearest available illustration of why supply continuity belongs in a material assessment alongside performance and certification — a material can pass every test and still disappear.

Verification Boundary -- What This Page Does Not Claim

This dossier compiles the supplier's published specification, the stated scope of certificates held, and referenced standards. It does not represent independent laboratory testing, production batch monitoring, or transaction data. Suitability judgements derive from the documents above, not from bench tests.

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