Spiber Inc. partners with Botto Giuseppe in yarn launch 

Spiber, a pioneer in protein fiber, announces its partnership with Italian premium mill Botto Giuseppe, provider of  yarns made from natural fibers such as wool and cashmere.

Since beginning their collaboration in 2023, this partnership has resulted in the development of yarn blends containing 20–50 Brewed Protein™ fiber combined with cashmere, as well as 100 percent Brewed Protein™ worsted yarn. Botto Giuseppe is the first European mill to successfully develop and market yarn made entirely from Brewed Protein™ fiber. These yarns are versatile, suitable for weaving and knitting, and can be used in a variety of applications such as shirts, suits, and jersey knitwear. All yarns are now available for purchase through Botto Giuseppe.

At Pitti Filati, Florence, Italy, in January 2025, Spiber showcased a polo shirt made from 100 percent Brewed Protein™ yarn developed by Botto Giuseppe. This fabric exhibits an elegant touch endowed by the nature of Brewed Protein™ fibers and the manufacturer’s expertise.

Spiber and Botto Giuseppe look forward to exploring finer yarn counts in 100 Brewed Protein™ fiber materials and collaborate on customizations tailored for specific brands.

Brewed Protein™ fiber is a premium, plant-based material produced using Spiber’s fermentation (brewing) technology, providing a circular solution and pioneering a new category of protein fibers. Botto Giuseppe e Figli S.p.A. has been producing fine yarns and fabrics since 1876. It operates worldwide.