Mylo is produced by US-based Bolt Threads, which initially worked with spider silk and has partnered brands including Patagonia.

Sun Choe, chief product officer at Lululemon, said: “Sustainable innovation will continue to play a key role in the future of retail and product, and for us, leveraging a material like Mylo demonstrates our commitment to creating a healthier environment through lower-impact products, while also giving us the ability to reimagine pieces through a sustainability lens.”

Adidas is set to release footwear containing mycelium this year.