Strength: The primary function of the webbing is to restrain occupants during a sudden deceleration or impact. The tensile strength of the polyester fibers is a crucial factor, as it determines the webbing's ability to withstand the extreme force without breaking. Polyester is now commonly used for seat belt material. https://www.fcc.gov/fcc-bin/bye?https://www.ledteks.com/seatbelt-and-safety-belt-webbing