It is obtained from semi-domesticated multi voltine silkworm, Antheraea assamensis. These silkworms feed on the aromatic leaves of Som and Soalu plants and are reared on trees similar to that of Tasar.

This golden yellow color silk is the second largest variety of silk being produced in India and quantity wise, it is next to mulberry silk and is approximately 7 - 8% of mulberry production. It is mostly reared in north eastern part of India like Assam, Meghalaya, and Tripura. Traditionally Eri silk used to be reared in wild and hence known as wild silk which is a non-continuous silk by nature Eri silk is always identified as Assam silk.

Due to its compatible character with fine wool, it has been identified as the best component in blends with fine wool to impart soothing luster and strength to the product in homogenous blends, which is otherwise not possible with any other silk variety.