Synthetic fibres are a term used on human-made treads. Chemicals combined into large molecules called polymers produce fibres like nylon, polyester, spandex, acrylic, modacrylic, olefin, saran, spandex, and vinyl.
The group, non-degradable fibres, is based on synthetic polymers from oil. The chemical bonding dos do not decompose within human and industrial timescales. Such as plastic bags, which are to be forbidden soon in most countries or heavily taxed.
Degradable fibre, fibre based on synthetic polymers from oil which decompose far more rapidly than other synthetic fibres, although this process takes several years typically.