What can be a substitute for wool? Why?

Artificial Wool is a substitute for wool. It is made up of Acrylic Fibres. It is a synthetic fibre. 

Tencel is one of the newest cruelty-free wool substitutes. It is breathable, durable, and biodegradable synthetic fibre. 

The wool obtained from natural fibres is quite expensive, whereas clothes made from acrylic are relatively cheap. They are available in a variety of colours.

Many people are allergic to wool and use alternatives to wool.