Polyester (aka Dacron) looks and feel like nylon but has half the stretch and usually comes with a green tracer while nylon has a blue one or none at all. It also best against abrasion of all the standard fibers. It is heavier than nylon but doesn't absorb moisture like nylon. It is best where low stretch is desired like utility boom trucks as often low headroom is an issue and is less conductive than nylon in case it gets wet.
See our separate listing on Utility Boom Truck replacement lines in the rope section.
* QUANTITY DISCOUNTS AT 150’,300’, 600’ & 1200’ for 7/8" to 1-1/8"*