There are two main types of natural fibres; protein-based fibres (animal fibres) and cellulose-based fibres (plant fibres). The main source of animal fibres are from sheep (Lambswool, Merino, Shetland wool), others are from goat (Cashmere) (Mohair), Alpaca, rabbit (Angora) and Silk. The most commonly used plant fibres are Cotton, Linen, Hemp and Bamboo. Lyocell and Modal fibres are cellulose-based and produced from wood. 

Viscose (rayon) is a semi-synthetic made from naturally sourced polymers like cellulose but are still man-made.

Synthetic fibres are from man-made polymers such as polyamide (Nylon), Polyester, Polypropylene and can be used to make a variety of fibres like Metallic yarns, dissolvable yarn (Solvron), Reflective yarns and elastane (Lycra).