Polyester thread looks, feels, and sews like nylon. You cannot tell the difference just by looking at the thread and differences in many technical specifications are insignificant. This means that polyester works just as nylon in most applications including: upholstery, leatherwork, auto interiors, banners and flags, sports gear, dog collars, horse saddles and tack, knife sheaths, gun holsters, fishing lures, and brief cases. Specification Origin : Manmade fibre Raw Material : Super Bright 100% Polyester Filament Yarn Appearance : Brilliant; More artificial sheen Touch : Harder Market Segment : Garments / Apparels & Badge orientated Strength : High strength, too strong for some applications Washing : Heavy duty detergent/bleach washing, chlorine & stonewashing