The three sided fiber formed by drawing polyester resin through a die or spinneret. The basic shape of Reemay fibers.

A fibre with a three-pointed, star-shaped cross-section. This gives the fibre rigidity and resilience. Also, it has many reflecting surfaces which are efficient at scattering light to hide dirt. For these reasons, trilobal fibres are often used in carpets. The reflective surfaces can also give the fibre a sparkling appearance.

A multi-sided fiber that reflects light resulting in fabrics with stronger color tones and noticeable sheen.