Nylon/Polyamide: The most expensive and "heavy-duty" net material. It has incredible elasticity and durability against powerful shots, but becomes heavier when wet. Intended strictly for professional or advanced use.
Polyethylene: Extremely weather-resistant, does not absorb water, and does not get damaged if left outside during winter. It is the number one choice for open and exposed fields.
Polypropylene: Softer material, "stands" more nicely on the goal, but is more sensitive to sunlight. It is perfect for indoor fields or for goals that are stored during the winter.