The coated nylon used in F18 kites stretches a little and is more forgiving of trimming errors. Nylon has better tear resistence than polyester. Polyester kites do not stretch as much, but are brittle and tear easily. Since polyester kites stretch less, they hold their shape better. Its a trade off between ease of use/durability and performance.

Last edited by tburd590; 03/11/11 10:12 AM.