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Samia by Knit Picks
- 80% cupro, 20% mulberry silk

Cupro is a silky, semi-synthetic fabric made from cotton linter, often called “vegan silk” or cuprammonium rayon.
Cupro is a man-made cellulosic fiber derived from the tiny, silky fibers called cotton linter, which cling to cotton seeds after ginning and are too short to spin into regular cotton fabric. These fibers are dissolved in a cuprammonium solution—a mixture of copper and ammonia—then extruded through a spinneret into a chemical bath to form filaments, which are spun into yarn and woven into fabric. This process makes cupro a semi-synthetic fiber, as it originates from a natural source but undergoes chemical transformation .

Properties and Uses
Cupro is prized for its silky texture, smooth drape, and breathability, closely resembling silk in feel and appearance. It is lightweight, soft, and often used for dresses, skirts, blouses, linings, and summer jackets where a luxurious drape is desired. Unlike silk, cupro is machine washable and vegan, making it a cruelty-free alternative.

Sustainability Considerations
Cupro is considered more sustainable than conventional silk or some synthetic fabrics because it uses cotton waste that would otherwise be discarded. However, the production process involves copper, ammonia, and caustic soda, which can be environmentally harmful if not managed properly. While it is biodegradable and plant-based, the overall sustainability depends on responsible chemical handling and sourcing of cotton.

Other Names
Cupro is also known as cupra, ammonia silk, Bemberg (a brand name), and cuprammonium rayon. It has been manufactured since the late 19th century and remains a niche but valued fabric in sustainable and luxury fashion.