Synthetic fibres are man-made fibres produced through chemical synthesis, usually derived from petrochemicals, and they are classified based on their distinct physical, chemical, and performance properties. These fibres are designed to mimic natural fibres while enhancing durability, strength, and versatility. Their classification is essential in the field of fashion textiles, product development, and merchandising because it guides textile designers and merchandisers in choosing the right fibre for specific apparel or product requirements. One major category is polyester fibres, which are known for their exceptional strength, wrinkle resistance, and dimensional stability. Polyester does not shrink easily and is highly resistant to stretching, making it a preferred choice in fashion for sportswear, dresses, and home textiles. In product development, polyester is valued for its ease of blending with other fibres like cotton, enhancing comfort without sacrificing durability. Merchandising of polyester products often highlights their easy-care and quick-dry properties, appealing to consumers with busy lifestyles. Another important group is polyamide fibres, commonly known as nylon.