What is the difference between Nylon nets and Poly nets?
Poly nets are made of a plastic material, and don't last as long as Nylon nets. However, Poly nets are naturally water resistant, and so are more suitable for outdoor use than Nylon on it's own. The best material you can get for your net is Nylon with NetSeal. This will make the net water resistant and provide an additional layer of protection from ball abrasion. You can read more about Nylon and Poly here.