Virgin or regenerated plastics for the production of textile fibres based on nylon, polyamide, polyethylene and polyester. These types of polymers are used to produce yarns with antibacterial and anti-odour properties that are also flexible and resistant, as well as allowing for colour customisation already in the formulation stage, eliminating the need for subsequent dyeing. The products are non-toxic and completely safe, even in contact with the skin, and can be sent for chemical recycling, allowing the materials to be recovered once the garment has reached the end of its life.