It was known to ancient Chinese traders as mermaid silk and mentioned on the Rossetta Stone. Those who weave it swear a Sea oath to never profit from its production and there’s only one weaver of it left in the world: Chiara Vigo (https://www.chiaravigo.it/). Byssus silk is a mind-boggling textile. It’s made from the bundle of filaments that molluscs use to attach themselves to rocks. When collected together these filaments look like spun sugar and are three times finer than human hair. To make 200g of textile requires 300 dives.