Xenylon was an algae-based synthetic material used in the Federation to make Starfleet uniforms. (TAS episode: "The Terratin Incident")

It was waterproof (TOS novel: Death's Angel) and fireproof (TOS movie: Star Trek VI: The Undiscovered Country; TNG novel: Power Hungry), but could tear quite easily. (TOS episode: "The Savage Curtain")

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